PanoRadar marks a breakthrough in the ever-advancing world of robotics, addressing the challenge of providing effective perception systems for robots that can function in severe weather and unfavorable conditions. 



Unlike traditional sensors, PanoRadar uses radio waves to penetrate smoke, fog, and even certain materials, offering a robust alternative to light-based systems. 



This innovative approach paves the way for more resilient robotic applications, from autonomous vehicles to rescue missions in hazardous environments.



<h2 class="wp-block-heading" id="h-limitations-of-traditional-sensors">Limitations of traditional sensors</h2>



Current sensor systems, such as cameras or LiDAR, rely on light, which limits their effectiveness in conditions like heavy smoke or fog. Alternatively, they may rely on traditional radar which can 'see' through walls and other obstacles, but which produce images lacking in detail.



Nature, however, shows us that perception need not rely solely on light. Bats use <a href="https://www.earth.com/news/soundwaves-can-be-used-to-move-objects/" target="_blank" rel="noreferrer noopener">sound wave</a> echoes for navigation, while sharks detect electrical fields from their prey's movements. 



These examples highlight alternative perception methods that can inform technological innovations, like radio wave-based sensing.



<a href="https://www.earth.com/news/some-radio-waves-disrupt-the-magnetic-compass-of-migratory-birds/" target="_blank" rel="noreferrer noopener">Radio waves</a>, with their longer wavelengths, can penetrate challenging conditions and even certain materials, surpassing the limitations of human vision and conventional sensors. 



<h2 class="wp-block-heading" id="h-panoradar-a-new-era-of-robot-vision">PanoRadar: A new era of robot vision</h2>



Enter researchers from the <a href="https://www.upenn.edu/" target="_blank" rel="noreferrer noopener">University of Pennsylvania</a> School of Engineering and Applied Science (Penn Engineering). They have initiated a new era in robot vision with their creation, the PanoRadar.



This novel invention enables robots to perceive their surroundings in three dimensions with incredible detail, by transforming simple radio waves into detailed, 3-D images of the environment.



"Our initial question was whether we could combine the best of both sensing modalities - the robustness of radio signals, which is resilient to fog and other challenging conditions, and the high resolution of visual sensors," explained Mingmin Zhao, assistant professor of computer and information science.



The birth of PanoRadar is the novel answer to this complex challenge. It has opened new possibilities for robotic perception in environments where traditional systems fail.



<h2 class="wp-block-heading" id="h-how-does-panoradar-work">How does PanoRadar work?</h2>



Think about how a lighthouse works. It sweeps its beam in a circle, scanning the entire horizon, revealing the presence of ships and coastal features. That's how the PanoRadar operates. 



It consists of a rotating vertical array of antennae that scan the surroundings. These antennae send out radio waves and listen for their reflections from the environment.



But PanoRadar is not just a simple scanner. It intelligently combines measurements from all rotation angles, enhancing its imaging resolution. 



"The key innovation is in how we process these radio wave measurements. Our signal processing and <a href="https://www.earth.com/news/machine-learning-reveals-how-to-prevent-covid-19-from-ever-returning/" target="_blank" rel="noreferrer noopener">machine learning</a> algorithms are able to extract rich 3D information from the environment," explained Zhao.



This novel approach allows PanoRadar to achieve imaging resolution comparable to that of LiDAR, but at a fraction of the cost.



<h2 class="wp-block-heading" id="h-comprehending-and-interpreting-complex-data">Comprehending and interpreting complex data</h2>



Implementing high-resolution imaging while the robot is moving presented a significant challenge. The team needed to combine measurements from various positions with sub-millimeter accuracy.



"Even small motion errors can significantly impact the imaging quality," said Haowen Lai, lead author of the paper.



In addition, they had to train their system rigorously to comprehend and interpret the complex data it receives, to ensure that it could accurately identify and understand various objects and environmental features in real time.



"Indoor environments have consistent patterns and geometries. We leveraged these patterns to help our AI system interpret the <a href="https://www.earth.com/news/radar-imaging-will-help-protect-polar-bears-from-human-disturbances/" target="_blank" rel="noreferrer noopener">radar</a> signals, similar to how humans learn to make sense of what they see," explained Gaoxiang Luo.



Thanks to machine learning algorithms, the model was able to improve its understanding against reality using LiDAR data.



<h2 class="wp-block-heading" id="h-radio-waves-and-robot-vision">Radio waves and robot vision</h2>



PanoRadar’s capabilities extend beyond what traditional sensors can perceive.



"Our field tests across different buildings showed how radio sensing can excel where traditional sensors struggle," said Liu. "The system maintains precise tracking through smoke and can even map spaces with glass walls."



This advantage comes from the ability of radio waves to pass through airborne particles with ease, allowing the system to detect elements that LiDAR often misses, such as glass surfaces. 



Additionally, PanoRadar's high resolution enables it to identify people accurately, an essential capability for applications like autonomous vehicles and rescue operations in challenging environments.



These attributes make PanoRadar a game-changer for robots operating in difficult conditions, where reliability and precision are paramount.



The research will be presented at the 2024 International Conference on Mobile Computing and Networking (<a href="https://search.app?link=https%3A%2F%2Fwww.sigmobile.org%2Fmobicom%2F2024%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">MobiCom</a>).



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Giving robots 'superhuman' vision through radio waves

PanoRadar marks a breakthrough in the ever-advancing world of robotics, addressing the challenge of providing effective perception systems for robots that can function in severe weather and unfavorable conditions. Unlike traditional sensors, PanoRadar uses radio waves to penetrate smoke, fog, and even certain materials, offering a robust alternative to light-based systems. This innovative approach paves the way for more resilient robotic applications, from autonomous vehicles to rescue missions in hazardous environments. Limitations of traditional sensors Current sensor systems, such as cameras or LiDAR, rely on light, which...

Extreme weather events created by human-caused climate change have increased throughout the world. <a href="https://www.earth.com/news/crops-have-a-drought-memory-that-prepares-them-for-tough-times/">Droughts</a>, flooding, and storms often occur in combinations that intensify the impacts.&nbsp;



Research on extreme weather events has been mainly focused on the terrestrial impacts, and few studies have looked closely at changes occurring in the largest part of the Earth - the ocean.&nbsp;



In 2011, a heatwave off the coast of western Australia destroyed biodiverse kelp forests. This is probably the worst case known of the “blob,” a massive bubble of warm water that formed in the Pacific, killing millions of sea birds, fishes and other animals.&nbsp;



A team of scientists led by Professor Nicolas Gruber at ETH Zurich developed an ocean model to examine this extreme weather event. The researchers concluded that it was not only high temperatures that caused the mass die-offs, but also a combination of events occurring simultaneously.&nbsp;



“When marine life is confronted with multiple stressors at once, it has difficulty acclimatizing," said Professor Gruber. "For a fish species that’s already living at the upper end of its optimal temperature range, an added oxygen deficiency can mean death.”



In a paper published in the journal <a href="https://www.nature.com/">Nature</a>, the scientists call upon other researchers to pay greater attention to extreme weather events in the world’s oceans.&nbsp;



“To assess the risks of these kinds of events, we urgently need to study the chain of different environmental factors leading to such extremes more closely – and not only in individual regions, but also at the global level,” said Professor Gruber.



Leading by example, the scientists analyzed extreme weather events in the period from 1861 to 2020 and compared this to preindustrial times. The results showed that the number of warm ocean days has increased annually from an average of four to an average of 40.



Even though this is an obvious problem, the unfortunate reality is we know much less about marine ecosystems than the ones on land in which we live. For example, we do not know the tolerances of many different marine species.&nbsp;



"We know from Swiss forests that beech trees are less drought-​tolerant than, for instance, pines,” said Meike Vogt, a senior researcher in Gruber’s group.



“We lack broad understanding of the ecosystem structure and function in the various ocean regions. Only when we have this foundation will we be able determine the impact of climate change and extremes."



---By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

How does extreme weather impact marine ecosystems?

Extreme weather events created by human-caused climate change have increased...

<a href="https://www.earth.com/news/medicinal-cannabis-reduces-epileptic-seizures-by-86-percent/">Cannabis</a> plants - the source of medical marijuana, CBD oils and hemp - have a strange propensity to absorb heavy metals from soils. This ability makes them valuable for restoring contaminated soils, it can also lead to health problems in those consuming cannabis products.&nbsp;



A new meta-analysis led by scientists from <a href="https://www.psu.edu/">Penn State</a> looks at the absorption of heavy metals by cannabis and the ensuing health risks for consumers.&nbsp;



“Heavy metals, such as lead, mercury, cadmium and chromium, are known to be carcinogenic," said Professor Louis Bengyella. "The heavy-metal content of cannabis is not regulated; therefore, consumers could unknowingly be exposed to these toxic metals. This is bad news for anyone who uses cannabis but is particularly problematic for cancer patients who use medical marijuana to treat the nausea and pain associated with their treatments.”



Unfortunately, the problem is made worse by selective breeding of some strains, specifically for phytoremediation, that is the absorption of toxins from soil, air and water.&nbsp;



“The problem is if we use these strains that were developed for phytoremediation without considering why they were developed in the first place, we may unknowingly expose consumers to heavy metals,” explained Bengyella.



In the study, which is published in the journal <a href="https://www.researchgate.net/journal/Toxin-Reviews-1556-9551">Toxin Reviews</a>, Bengyella and colleagues looked at and analyzed previous research on phytoremediation, what happens to absorbed metals and the resulting health problems.&nbsp;



The researchers found that some commonly grown plants were used for phytoremediation because of their long stem length, fast growth, high root and leaf surface areas, all qualities that improve heavy metal absorption. The team also found that trichomes - hair like structures - are where heavy metals exit the plant.



“Trichomes are important because they store the CBD oil and the tetrahydrocannabinol (THC) that are desired by consumers," said Bengyella. "This led us to question if these heavy metals are there at the level of the trichome, what can they do to people?”



The scientists turned to the known health effects of heavy metals on people. They found that the metals absorbed by cannabis can cause a variety of health problems. Through reactions inside the human body, the metals can cause damage to enzymes, lipids, proteins and nucleic acids. Heavy metal consumption can lead to cancer and neurological problems.&nbsp;



“Cannabis consumed in combustive form represents the greatest danger to human health, as analysis of heavy metals in the smoke of cannabis revealed the presence of selenium, mercury, cadmium, lead, chromium, nickel and arsenic," said Bengyella.



"It is disturbing to realize that the cannabis products being used by consumers, especially cancer patients, may be causing unnecessary harm to their bodies.”



---



By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Cannabis absorbs heavy metals that may harm human health

Cannabis plants - the source of medical marijuana, CBD oils...

Since the <a href="https://www.earth.com/news/over-half-of-the-worlds-vertebrates-reside-in-the-tropics/">tropics</a> are becoming hotter due to climate change and deforestation, the ability of outdoor workers to perform their jobs safely is increasingly reduced. This is the conclusion of research led by <a href="https://duke.edu/">Duke University</a> and published in the journal <a href="https://dx.doi.org/10.1016/j.oneear.2021.11.016">OneEarth</a>.



The study suggests that in recently deforested locations, almost five million people lost at least half an hour of safe outdoor work time per day.



“There is a huge disproportionate decrease in safe work hours associated with heat exposure for people in deforested locations versus people in forestated locations just over the past 15 or 20 years,”&nbsp;said study lead author Luke Parsons, a climate expert at Duke.



“There is a small amount of climate change that has happened over the same 15-year period, but the increase in humid heat exposure for people living in deforested relative to forested locations was much larger than that from recent climate change.”



Since trees block out the sun’s radiation and cool down the air through evapotranspiration (a process when plants transport water from the soil and evaporate it through the leaves), deforestation is associated with an increase in local temperatures.



“The trees in the tropics seem to limit the maximum temperatures that the air can reach. Once we cut those trees down, we lose that cooling service from the trees, and it can get really, really hot,” explained Parsons.&nbsp;



“In the Brazilian Amazon, for example, where huge swaths of the rainforest have been cleared in the last 15 or 20 years, the afternoons can be up to 10 degrees Celsius warmer than forested regions.”



Using satellite data and meteorological observations, Parson and his colleagues tracked the temperature and humidity levels in 94 countries with tropical forests in America, Africa, and Asia, from 2003 to 2018. They estimated that, in recently deforested areas, approximately five million people lost about half an hour, and 100,000 lost up to two hours of safe outdoor work time per day.



“I think the research has a positive message and a negative message. The negative message is that if we cut down trees, we not only cause problems for the ecosystem and global carbon emissions, but we also lose local cooling services that provide a comfortable and safe place to work.”&nbsp;



“But the positive message is that if we can prevent forest loss, we can maintain cooling services along with all the other benefits forests provide. Importantly, the relationship between the health of the forests and nearby people offers an additional, locally relevant reason to prevent tree loss,” Parsons concluded.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Deforestation made outdoor work unsafe for millions

Since the tropics are becoming hotter due to climate change...

We have all had the experience of gasping out loud when we hurt ourselves, or <a href="https://www.earth.com/news/breathing-exercises-improve-focus-in-children-with-adhd/">breathing</a> faster when we get a fright. But the reason why our breathing rate increases when we are anxious or in pain was not previously understood.&nbsp;



In recent research, however, a team of scientists from the <a href="https://www.salk.edu/">Salk Institute</a> has found that a neural network in the brain coordinates breathing rhythm with feelings of pain and fear. They propose that this finding could lead to the development of an analgesic that would prevent opioid-induced respiratory depression (OIRD), the disrupted breathing that can cause death in those who overdose on opioid drugs.



Opioid medications are often used as painkillers, and they are effective at reducing pain. However, they also reduce breathing rate, sometimes to the extent that the user stops breathing and dies. There was clearly a need to understand the mechanism whereby breathing rate is coordinated with the experience of pain.&nbsp;



In the study, published today in the journal&nbsp;<a href="https://www.cell.com/neuron/home">Neuron</a>, the Salk scientists focused on a group of neurons in the brainstem called the lateral parabrachial nucleus. Nerve cells in this region are arranged in the form of a core, which is surrounded by a shell. They found that, whereas neurons in the core project to the amygdala, an area of the brain that processes fear and the emotional experience of pain, neurons in the shell project to the pre-Bötzinger complex, a region that generates breathing rhythm.&nbsp;



The core and shell neurons influence each other according to inputs from these areas, making us breathe faster when we experience pain or anxiety.



“We are the first group to demonstrate how the lateral parabrachial nucleus coordinates breathing and pain,” said study senior author Professor&nbsp;<a href="https://www.salk.edu/scientist/sung-han/">Sung Han</a>. “By understanding the circuits in this brain region, we may be able to tease apart breathing regulation and pain regulation to develop a medication that inhibits feelings of pain without repressing breathing, like OIRD.”



Researchers in Professor Han’s lab had previously shown that opiates like morphine repress breathing by triggering specific receptors, called mu opioid receptors (MORs). This leads to the inhibition of neurons that express these receptors. They also showed that reactivating the cells that express MORs can reverse OIRD. Their current research suggests there may be different approaches to preventing OIRD, possibly by inhibiting neurons in the region’s core (blunting fear/anxiety) while exciting similar neurons in the shell (supporting breathing).



In order to show how the core and shell neurons coordinate breathing with pain and emotions, the researchers first used light and chemical agents to prove that manipulating the MOR-expressing neurons in the lateral parabrachial nucleus alters breathing rate in mice. They then used fluorescent tracers to map the inputs and outputs to the MOR-expressing neurons.&nbsp;



The results showed that nerve cells in the core project to the central amygdala, while neurons clustered in the surrounding shell project to the pre-Bötzinger complex. When they recorded electrical activity in neurons from one of the regions (core or shell), while stimulating activity in the other region, they found that the two groups of nerve cells were connected to one another by means of an excitatory network of neurons. It is through this network that signals of fear and pain are coordinated with breathing rhythm.&nbsp;



“We have found very intricate circuits involving upstream and downstream input to these neurons. By uncovering this circuit mechanism, we can better explain why breathing can often be coordinated with pain and anxiety,” said first author Shijia Liu, a graduate student in Han’s lab.



Professor Han is eager to see the team’s discovery have a functional application. “The biggest problem these days is that opioids reduce pain but also reduce breathing, so people die."



"By understanding those two mechanisms in our research, maybe we can manipulate certain populations of neurons by pharmacological intervention so that we can control pain without changing the breathing.”



The researchers in Han’s group are now undertaking genetic analyses of the core and shell neurons to identify specific functional markers that regulate pain or breathing.



---



By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Why does our breathing rate increase when we feel pain?

We have all had the experience of gasping out loud...

The rising concentration of <a href="https://www.earth.com/news/seagrass-meadows-absorb-less-co2-than-previously-thought/">carbon dioxide</a> in the atmosphere is causing major changes in ocean surface temperatures and acidification, to the detriment of an increasing number of marine ecosystems. 



A new study led by the <a href="https://www.adelaide.edu.au/">University of Adelaide</a> shows that the way fish interact in groups has been significantly modified by both ocean acidification and global warming. In particular, fish shoals become less cohesive and less capable of dodging predators when the water is more acidic.



“Fish show gregarious behavior and cluster in shoals, which helps them to acquire food and protect themselves against predators,” said study leader Ivan Nagelkerken, a professor at the University of Adelaide’s <a href="https://www.adelaide.edu.au/environment/">Environment Institute</a> and Southern Seas Ecology Laboratories.



“Many gregarious tropical species are shifting poleward under current ocean warming and interacting in new ways with fish in more temperate areas.”



The scientists investigated how fish species interacted and behaved when water temperatures and acidification changed under controlled laboratory conditions. When coordinating together in a shoal after being spooked by predators, tropical and temperate fish species usually tend to move to the right. However, this bias significantly diminished in conditions when ocean acidification levels were higher.&nbsp;



“Mixed shoals of tropical and temperate species became less cohesive under future climate conditions and showed slower escape responses from potential threats,” explained study co-author Angus Mitchell, a doctoral student at the <a href="https://www.adelaide.edu.au/">University of Adelaide</a> who performed the laboratory experiments.



These findings suggest that climate stressors such as acidification or warming have a direct effect on fish behavior and the ways in which different species of fish interact.



“Strong shoal cohesion and coordinated movement affect the survival of a species: whether to acquire food or evade predators,” said Professor Nagelkerken.



“If the ability for fish to work together is detrimentally affected it could determine the survival of particular species in the oceans of the future. Tropical species may initially fare poorly when moving into new temperate areas,” he concluded.



The study is published in the journal <a href="https://doi.org/10.1111/gcb.16022">Global Change Biology</a>.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Ocean acidification disrupts the behavior of fish shoals

The rising concentration of carbon dioxide in the atmosphere is...

Meerkat groups have a clear, undeniable leader: the matriarch. Together with a lucky <a href="https://www.earth.com/news/mating-crickets-lower-their-standards-when-exposed-to-traffic-noise/">mate</a> that she chooses, the matriarch rules over a group of subordinate males and females of all ages. 



According to a new study led by <a href="https://duke.edu/">Duke University</a>, the matriarch's dominion depends almost entirely on her extremely high levels of testosterone, particularly during her frequent pregnancies. These findings suggest that, paradoxically, testosterone-fueled aggression might be a crucial part in the evolution of cooperation in meerkat social groups.&nbsp;



Meerkat matriarchs are far from being benevolent leaders. Since subordinate meerkats usually help raise the matriarch’s pups, she needs to make sure that these pups receive undivided attention. To ensure this, she often attacks pregnant subordinates, expelling them from the group, or killing their newborn pups. 



Thus, while very few of a matriarch’s subordinate females manage to have surviving pups in a given year, a matriarch can have as many as three or four successful litters in a good year.&nbsp;



Besides preventing female subordinates from reproducing, matriarchs shows their dominion by pushing, shoving, biting, and growling, and mark their territory by rubbing their behinds against shrubs and rocks, spreading a pungent substance produced by their anal glands.



By studying 22 clans of meerkats at the Kuruman River Reserve in South Africa’s Kalahari Desert, the scientists found that the matriarchs’ domination and success are caused by their very high levels of testosterone.



“We always think of male competition being driven by testosterone, but here we’re showing that it’s driving female competition too,” said study lead author Christine Drea, a professor of Evolutionary Anthropology at Duke University.



“In non-pregnant matriarchs, testosterone values are equivalent to the males’, and just a little bit lower in subordinate females. But when matriarchs get pregnant, they ramp up.”



Moreover, once born, their puppies were also highly assertive and aggressive, furiously demanding food and care from their mother’s subordinates. This shows that their parent’s testosterone was transmitted to them inside the womb. If pregnant mothers were given flutamide, a testosterone-blocker, both theirs and the pups’ aggression levels dropped significantly.&nbsp;



“Here we have experimental results revealing a new mechanism for the evolution of cooperative breeding, one that is based on testosterone-mediated aggression and competition between females,” Drea said. “Females are not primarily competing for food. Competition is about ensuring that other individuals help raise their kids. And testosterone helps them win that reproductive battle.”



“When people think about cooperation, they usually think about altruism or helping others. This study is showing that cooperation can also arise through aggressive means, and quite effectively,” she concluded.



The study is published in the journal <a href="https://dx.doi.org/10.1038/s41467-021-27496-x">Nature Communications</a>.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Meerkat societies are structured by testosterone-driven aggression

Meerkat groups have a clear, undeniable leader: the matriarch. Together...

The last and longest full moon of the year will be visible for three consecutive nights, starting Friday, December 17, 2021, and is set to peak at 11:37 p.m. EST on Saturday. This event is celebrated in many parts of the globe and is often associated with local cultural and historical <a href="https://www.earth.com/news/baltic-pottery-reveals-ancient-culinary-traditions/">traditions</a>. 



While in the United States, this moon is known as the “Cold Moon,” a Mohawk name referring to the chilly weather conditions during this period, in Europe, ancient pagans called it the “Moon before Yule,” in honor of Yuletide, an annual indigenous three-day festival during which pre-Christian Germanic peoples celebrated the winter solstice.&nbsp;



In druid traditions, the so-called “Oak Moon” is connected to the ancient druid custom of harvesting mistletoe from oak trees at the onset of winter, a practice that was first documented by the Roman historian Pliny the Elder in the 1st century CE.



The Cold Moon is also celebrated in several Eastern traditions. For Hindus, this moon is associated to the Datta Jayanti festival, which commemorates the birthday of the Hindu god Dattatreya (Datta), and to the Thiruvathira festival that takes place annually in the Indian states of Kerala and Tamil Nadu and celebrates the meeting between Lord Shiva and the Goddess Parvathi.&nbsp;



For the Buddhists in Sri Lanka, the “<a href="https://www.officeholidays.com/holidays/sri-lanka/unduvap-full-moon-poya">Unduvap Full Moon Poya</a>” marks the arrival in Anuradhapura, an ancient political and religious capital city, of a tree sapling supposedly collected from the famous Bodhi tree under which Buddha is said to have attained Enlightenment. The sapling was brought to Anuradhapura by King Ashoka’s daughter, Sangamitta, in the third century BCE.



In China, this moon is currently called “Chang’e Moon,” in the honor of the Chinese astronauts who landed on the moon in the Chang’e space missions from December-January 2013, 2019, and 2020. These space missions and the holiday get their name from the Chinese goddess of the moon, Chang’e, who lived on the moon with her pet rabbit Yutu.&nbsp;



Regardless of its name or cultural associations, this moon remains a spectacular event all over the world, offering breathtaking views of the night sky during an entire weekend.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Longest full moon of the year will peak Saturday

The last and longest full moon of the year will...

Ant mating is very different from the experience of humans and other <a href="https://www.earth.com/news/small-mammals-are-vanishing-in-the-uk/">mammals</a>. Formica ants seasonally take to the air in dizzying flights where males and females join in aerial coupling. The males soon die after these forays, while the females land, chew off their own wings and go about the business of creating new ant colonies. 



The females can carry the sperm from their short tryst with the males for a decade to help grow their colony.&nbsp;Scientists have long known that queens can produce broods entirely male or female, although the mechanism has remained elusive.&nbsp;



“It’s weird to have any parent that’s only producing one sex or the other,” explained Jessica Purcell, an entomologist at the <a href="https://www.ucr.edu/">University of California Riverside</a> (UCR).



A new study led by Purcell reveals that female ants carry two copies of a sex determining chromosome while males carry only one copy. This means to create males, the female can simply lay unfertilized eggs or control the sex with her genetics.&nbsp;



“Male ants develop from unfertilized eggs their mother lays," said study senior author Alan Brelsford. "Therefore, male ants, as well as bees and wasps, genetically have a mother but no father.”&nbsp;



The colony sex ratio can also be manipulated by starving certain larvae or killing them directly. Sometimes, the availability of food is a factor in the sex ratios of a colony. “When extra food is dumped on a colony, it produces fewer males,” said Brelsford,



The researchers want to more thoroughly explore how these genetics work in different habitats throughout the ant’s range. Such research they hope could help North American ants, which tend to coordinate their mating flights with different seasons and temperatures. 



The scientists worry that climate change could have a negative impact on native ants, which are important to ecosystems. “Ants are really integral to ecosystems as one of the most abundant insects," said Purcell. "Gardeners tend to love earthworms, but ants do similar things to enhance soil health.”



The research is published in the <a href="https://www.pnas.org/">Proceedings of the National Academy of Science</a>,&nbsp;



---



By <a href="mailto:zachfitzner@yahoo.com">Zach Fitzner</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The sex of an entire ant colony is determined by the queen

Ant mating is very different from the experience of humans...

In order to better understand how climate change will affect ecosystems, a team of 80 international scientists have recently performed an unprecedented <a href="https://www.laurameredith.com/?page_id=1293">experiment</a>: they forced the world’s only enclosed <a href="https://www.earth.com/news/top-10-rainforests/">rainforest</a> (located in the University of Arizona's <a href="https://biosphere2.org/">Biosphere 2</a> research facility) through a four-month long controlled <a href="https://www.earth.com/news/europe-will-face-more-frequent-and-extreme-droughts/">drought</a> and recovery.



The researchers noted that, although there was a 70 percent drop in the rainforest’s carbon storage capacities during the drought period, an intricate web of water-use strategies and soil interactions emerged to support the forest’s resilience against severe drought.



"The forest was, in some ways, surprisingly resilient to the drought," said study lead author Laura Meredith, an assistant professor in the&nbsp;<a href="https://snre.arizona.edu/">School of Natural Resources and the Environment</a> at the University of Arizona.



"We used stable isotopes to trace the movement of carbon and water through the ecosystem under normal conditions and severe drought, which revealed surprising plant-ecosystem interactions," Professor Meredith explained.&nbsp;



"Importantly, individual plants did not all respond to drought in the same way. Some were highly drought sensitive and quickly slowed their critical carbon and water cycling to play it safe, while others were more tolerant of drought and maintained their function even under more risky drought conditions."



Large, drought-sensitive trees which generally consume the most water, suffered the fastest and most severely from the lack of water. However, they did not immediately tap into the water resources in the deep soil, as researchers expected.



“Instead, they drastically reduced their water consumption and only resorted to their deep-water reserves under very extreme drought," said another of the project leaders, Christiane Werner, a professor of Ecosystem Physiology at the <a href="https://uni-freiburg.de/">University of Freiburg</a>. "In this way, they conserved the deep-lying water reserves for as long as possible."



On the other hand, large, drought-tolerant trees held onto their canopy leaves the longest, providing shade to the undergrowth to protect it against further dehydration.



"Having a diversity of drought responses within the plants helped maintain greater carbon and water cycling functions of the entire ecosystem, both during the fullest extent of drought, as well as for quickly responding to the renewed availability of moisture with the arrival of rain," Meredith explained.



“Experimental ecosystems, like what we have at Biosphere 2, allow researchers to understand the holistic response of an entire ecosystem to stress. As we work to understand and predict ecosystem function in response to global change, we have to consider plant functional groups and their interactions with soils and the atmosphere, in both observational and modeling studies," she concluded.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Diverse water-use strategies help forests cope with drought

In order to better understand how climate change will affect...

Worldwide, the proportion of people over the age of 60 is predicted to double in the next three decades. An aging population brings with it many attendant health issues, not least of which is type 2 diabetes. This disease is characterized by insulin resistance, or an inability of the body cells to respond to insulin, and its treatment places a burden on public <a href="https://www.earth.com/news/vitamin-d-is-essential-for-heart-health/">health</a> systems globally.&nbsp;



Insulin resistance is often associated with reduced physical activity and so, as we age and become less active, we are more prone to developing type 2 diabetes. However, the precise mechanism whereby physical inactivity leads to the development of insulin resistance has not been demonstrated.



Now, in a study led by Professor Tony Tiganis of <a href="https://www.monash.edu/">Monash University</a>, researchers have discovered the metabolic mechanism whereby physical activity levels and insulin resistance are connected in laboratory mice.&nbsp;



According to Professor Tiganis, skeletal muscle cells constantly produce reactive oxygen species (ROS) and this process increases during physical exercise. Moderate exposure to these oxygen-derived free radicals is essential for normal cellular function in our bodies, and also induces the body’s adaptive response to produce antioxidants in defense. Regular exercise benefits health by enhancing antioxidant defenses against high levels of ROS, and this is one of the ways in which doing exercise makes us feel better.



“Exercise-induced ROS drive adaptive responses that are integral to the health-promoting effects of exercise,” said Professor Tiganis.&nbsp;However, a reduction in generation of ROS in skeletal muscle, brought on by decreasing physical activity as we age, is instrumental in the development of insulin resistance.&nbsp;



The research team found that, in mice, an enzyme called NOX-4 is essential for producing exercise-induced ROS and therefore for the adaptive responses that drive metabolic health. They found that levels of NOX-4 increased in skeletal muscle after the mice exercised and that this led to increased ROS, which elicited the adaptive responses that protect mice from the development of insulin resistance.



Importantly, the scientists have shown that the levels of NOX-4 in skeletal muscle are directly related to age-associated decline in insulin sensitivity.&nbsp;“In this study we have shown, in animal models, that skeletal muscle NOX-4 abundance is decreased with aging and that this leads to a reduction in insulin sensitivity,” said Professor Tiganis.



These findings help explain how physical activity actually enhances insulin responses and promotes metabolic health. In addition, the enzyme that is key in this mechanism has the potential to be targeted by drugs in order to promote its activity, thereby protecting against the consequences of aging, such as diabetes.&nbsp;



“Triggering the activation of the adaptive mechanisms orchestrated by NOX-4&nbsp;with drugs, might ameliorate key aspects of aging, including the development of insulin resistance and type 2 diabetes,” said Professor Tiganis.&nbsp;



“One of these compounds is found naturally, for instance, in cruciferous vegetables, such as broccoli or cauliflower, though the amount needed for anti-aging effects might be more than many would be willing to consume.”&nbsp;



The study is published today in the journal <a href="https://www.science.org/journal/sciadv">Science Advances</a>.



---



By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Enzyme produced during exercise protects against aging

Worldwide, the proportion of people over the age of 60...

Gasadalur,Village,And,Beautiful,Waterfall,,Sunny,Day,,Vagar,,Faroe,Islands,

The Faroe Islands are a small archipelago located midway between Norway and Iceland, about 200 miles off Scotland. Their <a href="https://www.earth.com/news/hidden-landscapes-found-beneath-the-north-sea/">landscape</a> is rocky, with towering cliffs dominating the sea, and the weather is inclement, strong winds continuously buffeting the shores. There is no evidence that the islands ever sheltered indigenous populations, thus making them one of the planet’s few lands that remained uninhabited until historical times.



While past archeological excavations have indicated that the <a href="https://www.earth.com/news/the-vikings-reached-america-long-before-columbus/">Vikings</a> were the first to reach the Faroe Islands around 850 AD, a new study led by Columbia University’s&nbsp;<a href="https://www.ldeo.columbia.edu/">Lamont-Doherty Earth Observatory</a> has found evidence that domestic sheep suddenly appeared on these islands around 500 AD, well before the Norse occupation, suggesting that an unknown band of humans settled there around that period.&nbsp;



The researchers sailed out to a lake near the village of Eiði, the site of an ancient Viking locale on the island of Eysturoy, and collected and analyzed sediment samples containing traces of over 10,000 years of environmental history. They discovered identifiable fragments of sheep DNA, as well as two distinctive types of lipids produced in the digestive systems of sheep, starting at 20 inches down into the sediment, suggesting that large numbers of sheep may have arrived there between 492 and 512 AD.



“We see this as putting the nail in the coffin that people were there before the Vikings,” said study lead author Lorelei Curtin, who did the research as a graduate student at the Lamont-Doherty Earth Observatory.



According to Curtin and her colleagues, these early settlers could have been Celts from present-day Scotland and Ireland, since many Faroese place names derive from Celtic words, and ancient, Celtic grave markings have been found in many places around the islands. Moreover, DNA studies of the modern Faroese show that, while their paternal lineages are Scandinavian, the maternal ones are largely Celtic.&nbsp;



While other North Atlantic regions also show this asymmetry - a possible sign that male Viking settlers had brought Celtic wives with them, the Faroese have the highest level of maternal Celtic ancestry, suggesting that a Celtic population might have preceding the Vikings.



More research is needed to assess whether Celtic populations may have reached other North Atlantic regions too during that period.



The study is published in the journal <a href="https://dx.doi.org/10.1038/s43247-021-00318-0">Nature Communications: Earth and Environment</a>.



---



By <a href="mailto:andrei.ionescu5891@gmail.com">Andrei Ionescu</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Humans reached the Faroe Islands much earlier than expected

The Faroe Islands are a small archipelago located midway between...

Holly,,Ivy,And,Mistletoe,Christmas,And,Winter,Greenery,Background.,Traditional

Christmas time has come around again and we are ready to deck our halls and trim our <a href="https://www.earth.com/news/citrus-greening-infects-entire-trees-before-its-detected/">trees</a>. But first, we are encouraged by the authors of a new article published in <a href="https://www.bmj.com/">The British Medical Journal</a> to take note of some of the nastier characteristics of the festive plants typically associated with the holiday season.



The researchers conducted informal interviews with 22 friends and colleagues on the plants they associated with Christmas, checked aisles of shops, garden centers and florists, looked in magazine back catalogs, and immersed themselves in Yuletide songs, films, and stories. Their friends and colleagues were largely from a British background, and the traditions and festive plants they mentioned reflect this.&nbsp;



The experts then looked up each plant species in the TOXBASE database to determine whether it had any harmful attributes. Those listed as low toxicity were excluded from further search criteria. For those listed as toxic, the authors searched PubMed, along with the terms “poison,” “poisoning,” and “Christmas.”&nbsp;



Luckily, their searches turned up little negative information about Christmas trees. It seems that these are safe to gather around, although some people who handle a lot of Christmas trees may develop a case of contact dermatitis.&nbsp;



The ivy we may use to deck our halls or adorn our tables is also a friendly plant. But the holly has sharp, spiky leaves and its berries contain saponins, which can cause an upset stomach, drowsiness, and even problems with balance and speech (ataxia), if consumed in large quantities.



It may well be fine to sneak a kiss with a loved one under the Christmas mistletoe, but you should not get any closer than this to the plant. All parts of it (the stem, leaves and berries) are poisonous. Mistletoe&nbsp;contains toxic proteins known as viscotoxins (ricin is a famous member of this family), and eating it may lead to blurred vision, gastrointestinal upsets, vomiting and fever. Cliff Richard’s famous seasonal song&nbsp;Mistletoe and Wine&nbsp;is a particularly disastrous combination, warn the study authors.



And if someone were to give you a pear tree for Christmas, you should be sure not to eat the seeds. Pears have seeds that contain amygdalin, which is converted to cyanide in the gut. While there are no reports of human cyanide poisoning resulting from pear seed consumption, it would be wise not to overindulge in these fruits.&nbsp;



Beware if your neighbor hangs up a wreath containing bittersweet and yew. Bittersweet is a nightshade, the berries of which contain solanine glycoalkaloids; high levels of these can bring on unpleasant abdominal cramps. Yew leaves contain alkaloids known as taxines, that cause cardiac dysrhythmias; eating just a few can prove fatal. The researchers state that yew was used as a method of suicide among defeated Celtic tribes in Julius Caesar’s conquest of Gaul.



People love to decorate their homes with indoor flowers during Christmas time. Cyclamen are safe indoor Christmas flowers, as are Christmas cactus and poinsettia. It seems that, although poinsettias have a reputation for being toxic, this is not true and most exposures to this festive plant don’t require medical attention. The sap may irritate your skin, however, and should definitely be kept away from your eyes.&nbsp;



Unfortunately, the ornamental Christmas rose, or hellebore, is not as benign. This plant contains cardiac glycosides, which may affect the heart’s rhythm and cause unpleasant symptoms in the stomach, intestines, kidneys and nervous system. The Jerusalem or Christmas cherry is another nightshade; its tempting berries contain toxic solanine glycoalkaloids that cause gastrointestinal symptoms if ingested.&nbsp;



And then there is the matter of Christmas dinner, which is also not without its pitfalls. For example, your roast potatoes are from the nightshade family and are related to the Christmas cherry. The growing buds (“eyes”) contain the same solanine glycoalkaloids on exposure to light and these are not destroyed by cooking. Luckily the potato tuber has a low concentration of solanines, unless it has turned green in the cupboard, prior to cooking, in which case these toxins may cause vomiting, diarrhea, delirium, and tachycardia.



Buttered parsnips should not present any dangers, say the study authors, as long as you are sure of their identity. In the past, foragers have sometimes mistaken poisonous water hemlock for parsnips, and have suffered seizures and kidney damage as a consequence.



It seems that even a sprig of rosemary used to flavor and garnish your roast dinner may be hazardous. The experts point to a case where a rosemary twig caused a perforated bowel and subsequent hepatic abscess. On the other hand, Brussels sprouts, do not seem to be poisonous, note the authors. “Looks like you’ll have to endure them after all.”



Finally, they sound a note of caution regarding cinnamon and nutmeg, two of the spices found in eggnog or mulled wine, not to mention Christmas pudding.&nbsp;



They suggest avoiding the “cinnamon challenge,” a viral video challenge to eat a spoonful of ground cinnamon in under 60 seconds without drinking anything. This challenge was apparently responsible for several cases of respiratory distress requiring medical attention. Cinnamon is a noxious powder that is bio-resistant in the lungs and may also cause hypersensitivity reactions.&nbsp;



Nutmeg, another typical Christmas spice, can trigger hallucinations at a remarkably low dose (less than a tablespoon). The chemical agent responsible, myristicin, has also been linked to gastrointestinal distress, seizures, psychosis, delirium and death.



In summary, the researchers recommend moderation in everything, along with sensible precautions, such as refraining from consumption of foliage, festive household plants, and unidentified wild species.&nbsp;



“We hope that this piece has given you the information necessary to navigate holiday foliage more safely,” they conclude.



---



By <a href="mailto:bosman@truewan.co.za">Alison Bosman</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Festive Christmas plants may not be as safe as you think!

Christmas time has come around again and we are ready...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Kainji Lake in north central Nigeria

[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Designing crops that can beat the heat

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How does salt makes things taste better?

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

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Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes the first comprehensive estimate of carbon density in the Saharan, Sahel, and Sudanian zones of Africa. In an effort to measure the amount of carbon stored across these drylands, a team of scientists used high-resolution satellite images and artificial intelligence to map nearly 10 billion individual trees. 



"The high spatial resolution (50 cm) combined with AI and field measurements used in this study is key to improving tree inventories in drylands," said Pierre Hiernaux, a French researcher working for NASA. "The ever-increasing availability of very high-resolution satellite imagery will make it possible to assess carbon pools and their dynamics at the individual tree level on a global scale."



"This study is exceptional because it is pioneering a type of approach that will revolutionize the monitoring of trees and forests on a global scale: in the short term, it will be possible to map the world's trees from the centre of the Amazon to our schoolyards," said <a href="https://www.inrae.fr/en">INRAE</a> researcher Jean-Pierre Wigneron.



"Many fields of application will become much more efficient and accurate, such as tracking carbon stocks, biodiversity, monitoring logging and protection against illegal forest degradation, in near real time.”



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Remote sensing will revolutionize the way we monitor trees

[sendtonews key="EjmSP20gQK-2593093-12187" type="single"] Today's Video of the Day from NASA...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The city of Dublin on Ireland's east coast

[sendtonews key="qjvhBOBnY8-2426650-12187" type="single"] Today's Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The province of Zaragoza in northeast Spain

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> features a visual dataset of.methane emissions from wetlands across the globe. Atmospheric methane levels have reached record highs in recent years, and wetlands are a major source of these emissions.&nbsp;



"Methane is an important greenhouse gas that contributes substantially to global warming. On a molecule by molecule basis, methane is much more efficient at trapping heat than carbon dioxide, the main driver of warming," says NASA.



"Though human activities, including agriculture, oil and natural gas production and use, and waste disposal, collectively contribute the majority of methane to the atmosphere, about a third of total methane emissions comes from wetlands."&nbsp;



According to NASA, understanding methane emissions from wetlands and other natural sources is critically important for scientists and policymakers who are working to combat climate change by reducing emissions from human activities.



Video Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Wetlands are a major source of methane emissions

[sendtonews key="f8fukm28Vz-2491833-12187" type="single"] Today's Video of the Day from NASA...

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The rapid retreat of the Columbia Glacier

[sendtonews key="0879czfG3k-1785905-12187" type="single"] Today’s Video of the Day from NASA...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

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Today’s Video of the Day from <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes why experts are studying zebrafish to gain a better understanding of how the immune system responds to injury. Zebrafish have the ability to repair and regenerate organs.



“Organ regeneration offers an exciting opportunity for studying the immune system and to inquire why some species can regenerate organs like the heart or missing limbs while others like humans cannot,” explained Dr. Tatjana Piotrowski.



Zebrafish sensory organ hair cells are an ideal system to investigate the pathways and cell types involved in regeneration since they are easily destroyed with antibiotics and begin regenerating within five hours. This enabled the researchers to identify the exact timing and genetic programs for each anti-inflammatory macrophage activation state.&nbsp;



“Our hypothesis is that human macrophages do not receive the proper chemical activation 'cocktail' to instruct pro-regenerative processes,” said Dr. Nicolas Denans. “Identifying the molecular recipe of macrophage activation in zebrafish may one day enable us to design regenerative immunotherapies in humans.”&nbsp;&nbsp;&nbsp;



“The new evidence is a valuable resource for comparative studies on the genetic programs involved in macrophage-mediated repair and regeneration. In other words, different types of injuries may induce different kinds of inflammatory responses. We want to decipher whether this 'language' is universal or if there are a variety of dialects."



Video Credit: Stowers Institute for Medical Research&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How the immune system responds to injury

[sendtonews key="0dEcERCq61-2283382-12187" type="single"] Today’s Video of the Day from Stowers...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes how record-breaking heat expressed itself around the world in 2022.



Scientists have determined that 2022 was the 5th warmest year since 1880. Furthermore, the last nine consecutive years have been the warmest on record.



From devastating floods and wildfires to natural disasters like Hurricane Ian, 2022 showed us yet again how a warming climate affects people across the globe.&nbsp;



"As we look back at 20:22 and years past, we see that each year we better understand the challenges we face and how important it is to meet them," says NASA.



Video/ Image Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

2022 illustrated the consequences of a warming climate

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...