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...

An unprecedented study demonstrates that potassium-packed foods such as bananas and avocados may help to prevent hardening of the arteries, or pathogenic vascular calcification. Researchers at the <a href="http://www.uab.edu/">University of Alabama at Birmingham</a> have shown that a diet lacking in potassium promotes elevated arterial stiffness, while a diet with increased potassium levels can actually lessen arterial stiffness.

Vascular calcification is linked to an increased risk of fatal <a href="https://www.earth.com/news/breakfast-prevent-cardiovascular-disease/">heart disease</a> and other cardiovascular events. The research team set out to examine the underlying mechanisms of this vascular condition in apolipoprotein E-deficient mice, which are prone to cardiovascular disease. The mice were fed either high, low, or normal levels of dietary potassium.

The team discovered that the mice fed a low-potassium diet had a significant increase in vascular calcification. On the other hand, the mice fed a high-potassium diet had significantly restrained vascular calcification. By using an arterial stiffness indicator called pulse wave velocity, the researchers also found that the low-potassium mice had increased stiffness of their aortas and high-potassium mice had decreased aortic stiffness.

"The findings have important translational potential since they demonstrate the benefit of adequate potassium supplementation on prevention of vascular calcification in atherosclerosis-prone mice, and the adverse effect of low potassium intake,” explained co-author Paul Sanders.

The researchers also took a look into the vascular effects of potassium intake on a molecular level. Low potassium amounts in a cell culture noticeably strengthened calcification of vascular smooth muscle cells. Previous research has shown that calcification of vascular smooth muscle cells resembles the differentiation of bone cells, which leads to the conversion of smooth muscle cells into bone-like cells.

With this in mind, the researchers set out to examine the growth of vascular smooth muscle cells in low-potassium cell culture. They found that the low-potassium conditions triggered the expression of several gene markers that are characteristic of bone cells while inhibiting the expression of vascular smooth muscle cell markers. This indicates that low-potassium conditions promote the transformation of the vascular smooth muscle cells into bone-like cells.

The findings of this study, which will appear in the journal <a href="https://www.jci.org/this-month">JCI This Month</a> in November, emphasize the importance of potassium in the diet. The research also provides a foundation for the development of new therapies to prevent or treat atherosclerotic vascular calcification.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Bananas may be crucial for keeping your arteries healthy

An unprecedented study demonstrates that potassium-packed foods such as bananas...

Researchers from the <a href="https://www.utah.edu/">University of Utah</a> have determined that many of the In-Vehicle Information Systems available in 2017 will be dangerously distracting if enabled while automobiles are in motion. The study, conducted for the <a href="https://www.aaafoundation.org/">AAA Foundation for Traffic Safety</a>, revealed that these car features take the driver's attention off the road for too long to be safe.

"This is troublesome because motorists may assume that features that are enabled when they are driving are safe and easy to use," said lead author David L. Strayer. "Greater consideration should be given to what interactions should be available to the driver when the vehicle is in motion rather than to what features and functions could be available to motorists.”

The researchers investigated infotainment systems in 30 different 2017 vehicles. Participants in the study engaged in tasks using voice, touch screen, and other interactive technologies. The tasks included making a call, sending a text message, tuning the radio, or navigating a program while <a href="https://www.earth.com/video/reasonable-driving-saves-gas/">driving</a>.

The team developed an advanced rating scale which ranged from low to very high demand to measure which activities were most distracting to the drivers. The study demonstrated that drivers using features such as touch-screen technology took their hands, eyes, and mind off the road for more than 24 seconds.

Programming navigation proved to be the most distracting task, which took drivers an average of 40 seconds to complete. The second most distracting activity was text messaging, while tuning the radio and calling were the easiest tasks with about the same demand rating.

"We're putting more and more technology in the car that just does not mix with driving," said Strayer. "We're expecting to see more problems associated with distracted driving as more stuff is at the fingertips of the driver to distract them."

AAA said the findings of this study will ideally help automakers and system designers improve the functionality of infotainment systems and the level of attention they require. Strayer said his team hopes the research will also be used by consumers "to help make a good decision about what vehicle and what technology in the vehicle is best for them."

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Are new high-tech car features too distracting to be safe?

Researchers from the University of Utah have determined that many...

Winter in <a href="https://www.earth.com/news/china-air-pollution-years/">China</a> usually means spiked levels of air pollution and a haze full of harmful irritants that lingers over major cities like Beijing. Air pollution is known to negatively affect the respiratory system and can cause cardiovascular disease, among a wide range of other complications. But what specifically is behind the toxic haze over China?

Previously, it was suggested that ammonia emissions are the general aggravator behind the thick fog, caused by agricultural practices and car emissions. But researchers from the <a href="http://www.gatech.edu/">Georgia Institute of Technology</a> have now contested this theory. 

The team of researchers used computer models to determine that is highly unlikely ammonia is the root cause.

The study was published in the journal Scientific Reports and is an important step in understanding the mechanics and chemistry behind air pollution itself. 

“With China and other countries exploring ways to reduce air pollution, it's important to understand the chemistry behind how that haze forms,” said Rodney Weber, a professor in <a href="http://www.eas.gatech.edu/">Georgia Institute School of Earth &amp; Atmospheric Sciences.</a> “What we've found is that the atmospheric ammonia is not a large driver of those air conditions, as has been proposed.” 

Computer models allowed Weber and his colleagues to examine how sulfate aerosol, the major cause of haze, is produced from sulfur dioxide and nitrogen oxide. Sulfur and nitrogen oxides are emitted from burning fossil fuels and interact together resulting in sulfate aerosol. 

"Typically, sulfate aerosol is produced through a chemical reaction that oxidizes sulfur dioxide to form sulfate particulates," said Athanasios Nenes, a professor and Johnson Faculty Fellow at the Georgia Institute. 

Some scientists believe that the high levels of ammonia increase concentrations of sulfate. But the researchers also examined this theory by running a number of simulations testing atmospheric conditions with different levels of gases, pollutants, and weather conditions. 

The results again showed that ammonia was not a major cause of the pollution. 

Instead, researchers point to transitional metals like iron, copper, and manganese emissions as a major contributor to dense air pollution. 

This study proves the futility in focusing solely on ammonia emissions as the cause of air pollution, and the researchers recommend that looking elsewhere could be far more cost-effective and have a bigger impact on improving air quality. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

What’s causing the thick haze that’s been blanketing China?

Winter in China usually means spiked levels of air pollution...

Gene editing of human embryos is a futuristic-seeming scientific advancement that is becoming more of a reality every day. CRISPR, the most well-known gene editing technique, has been in the news almost daily, as it may hold the greatest opportunity for preventing hereditary and genetic diseases in newborns.

However, these advancements come with their fare share of <a href="https://www.earth.com/news/edit-genes-human-embryos/">ethical concerns</a> as well. Beyond just preventing diseases, should parents be allowed to choose traits for their children that can help them be more successful in life – such as increased athleticism, beauty, or intelligence?

“Early studies with human embryos have established the feasibility of human germline genome editing but raise complex social, ethical and legal questions,” says Dr. Kiran Musunuru, an associate professor of cardiovascular medicine and genetics at the Perelman School of Medicine at the <a href="http://www.upenn.edu/">University of Pennsylvania in Philadelphia</a>. “The future is on us, whether we like it or not.”

Musunuru recently published a survey in the American Heart Association’s journal <a href="http://circgenetics.ahajournals.org/">Circulation: Cardiovascular Genetics</a>, which finds that the public should be consulted before gene editing is used on human embryos. This data on the state of gene editing was presented at an <a href="http://www.heart.org/HEARTORG/">American Heart Association</a> conference in May of 2017. 

The results showed that 80 percent of those surveyed supported gene editing in adults in order to prevent serious diseases, but not for non-disease related enhancements. Over 60 percent of respondents also supported conducting research on germline cells and using gene editing on germline cells for parents who have no other way to conceive a healthy child. However, the opinions were split on parents using germline gene editing to reduce their child’s risk of having a serious medical condition.

Also, 68 percent of respondents are in support of government coverage of costs for these treatments if it ensures that they are available to everyone. The caveat is that over 70 percent of those surveyed would be opposed to germline gene editing if the general public was not asked for approval first. 

It appears that this scientific advancement will quickly become a political issue, given the ethical concerns. Although the technology will not be perfected anytime soon, it’s important we determine how it should be used sooner rather than later.

--

By <a href="mailto:certz@earth.com">Connor Ertz</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Public opinion will dictate the future of gene editing technology

Gene editing of human embryos is a futuristic-seeming scientific advancement...

Billions of years ago, meteorites landed into warm ponds and started the necessary steps toward creating all life on Earth, according to new research from <a href="http://www.mcmaster.ca/">McMaster University</a> and the <a href="https://www.mpg.de/institutes">Max Planck Institute</a> in Germany.

The new study, published in the journal Proceedings of the National Academy of Science, documents how researchers were able to plausibly show what was previously just a theory. 

The team ran extensive calculations and included data from many different fields such as astrophysics, geology, chemistry, and biology. 

“No one's actually run the calculation before. This is a pretty big beginning. It's pretty exciting,” said lead author Ben K.D. Pearce from the McMaster's Origins Institute. 

Pearce and fellow co-author Ralph Pudritz explain that while the Earth was in its volatile stages, meteorites carrying essential elements landed in warm, nutrient-rich ponds and bonded molecular building blocks to pave the way for life. 

This bonding process was an important part in the creation of RNA polymers, what the authors describe as the “spark of life.” 

RNA-based life, according to the study, inhabited the <a href="https://www.earth.com/news/planets-earth-mars-created/">Earth</a> until DNA and in turn, higher based life forms evolved. 

“DNA is too complex to have been the first aspect of life to emerge. It had to start with something else, and that is RNA,” said Pudritz. 

This process of meteorites landing into ponds happened thousands of times, according to the to researcher’s calculations. 

“We're thrilled that we can put together a theoretical paper that combines all these threads, makes clear predictions and offers clear ideas that we can take to the laboratory,” Pudritz says.

The results also combat other popular theories of how life started on Earth. 

One alternative theory postulates that that life started in warm hydrothermal vents in the ocean. But the researchers contest this as a possibility because the bonding process could only have occurred in wet and dry cycles caused by the Earth’s natural processes of evaporation and condensation. 

Another theory suggests that space dust, which carries the same elements as meteorites, was the origin of life on Earth. But these researchers explain that space dust would have been too finite in concentration to create life. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>,<a href="https://www.earth.com/"> Earth.com</a> Staff Writer

Image Credit: Ben K.D. Pearce, McMaster University

Life on Earth began with meteorites crashing into small ponds

Billions of years ago, meteorites landed into warm ponds and...

New research has found that it is difficult to recall specific details until the hippocampus is fully formed, which usually happens during adolescence. 

The hippocampus is located in the medial temporal lobe and is the part of the brain that controls emotions, short-term memory, and long-term <a href="https://www.earth.com/news/exercise-youth-helps-memory/">memory</a>. 

Previous studies led scientists to believe that the hippocampus was fully formed around age 6. But new research from the <a href="https://www.mpg.de/institutes">Max Planck Institutes</a> in Germany and the <a href="https://www.stir.ac.uk/">University of Stirling</a> in Scotland found that the hippocampus is actually still forming until the early teens. 

Researchers asked study participants between ages six and fourteen, as well adults, to recall the specifics of two slightly different images they were shown. The researchers then compared these answers to MRI brain scans. 

Older test participants were able to recall specific details better. In addition, results of the MRI scans showed that the dentate gyrus and the entorhinal cortex, two parts of the hippocampus, were larger in their brains than in the younger subjects. 

This indicates that the hippocampus doesn’t stop growing until the early teens and forces a reevaluation of how young children learn and process the world around them. 

According to Markus Werkle-Bergner from the Max Planck Institutes, the study’s co-author, this  “is important, as it directly influences the fine balance between pattern separation and pattern completion operations and, thus, developmental changes in learning and memory.”

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Memory isn’t fully developed until teenage years

New research has found that it is difficult to recall...

With farming changes, it could be possible to reduce greenhouse gas emissions without severely risking food security, according to new research.

Sharply curbing deforestation and increasing sequestration of carbon in soil could bring significant cuts to carbon emissions without major risks to the global food supply, according to scientists from the <a href="http://www.iiasa.ac.at/">International Institute for Applied Systems Analysis</a>. 

But such a strategy could also lead to a rise food prices, the study showed.

"The land-use sector is key for successful climate change mitigation," said Dr. Stefan Frank, who led the IIASA study. "But providing an increasing amount of biomass for energy production to substitute fossil fuels while at the same time reducing emissions from the land use sector, for example through a carbon tax, could also have the effect of raising food prices and reducing food availability."

The land-use sector – made of agriculture, forestry and related fields – contributes nearly a quarter of carbon emissions globally. However, land-use can also help to mitigate the amount of atmospheric greenhouse gases. Vegetation can help to absorb carbon dioxide and store it before it reaches the atmosphere.

But deforestation releases much of that stored carbon, and the machinery used to strip new land for agriculture also emits carbon dioxide.

Farming changes could help to cut deforestation and drastically reduce carbon emissions, the researchers said.

Changes could include crop rotation, cover crops, and residue management, which have benefits such as preserving soil health and boosting crop production. 

"You keep the soil healthy, you offset greenhouse gas emissions, and you preserve crop yields at the same time," Frank said. 

Countries with a soil carbon sequestration program could even offer financial incentives to farmers who practice these crop management practices. 

"Agricultural soils could provide a key solution for climate change mitigation and adaptation and for food security, but changing land management to store carbon in soil organic matter will require large efforts that could be facilitated by multi-stakeholder platforms like the 4 per 1000 initiative,” said Dr. Jean-Francois Soussana of the <a href="http://www.inra.fr/en/Scientists-Students">French National Institute for Agricultural Research</a>, who coauthored the study.

The study has been published in the journal <a href="https://doi.org/10.1088/1748-9326/aa8c83">Environmental Research Letters</a>.

—

By <a href="mailto:kcathey@earth.com">Kyla Cathey</a>, <a href="http://www.earth.com">Earth.com</a> staff writer

Farming changes could be key to reducing greenhouse gases

With farming changes, it could be possible to reduce greenhouse...

One of the greatest threats for cancer patients is metastasis, when cancer cells leave tumors and enter the lymph nodes. But treating metastasis by surgery is also risky and can bring about many complications, so researchers have been striving to find better, non-invasive ways of combating it.

Now, a new study has found that a traditional Chinese ink called Hu-Kaiwen ink, or Hu-ink, could be used as an alternative in photothermal therapies or PTT. 

PTT is a new tumor treatment option that injects nanomaterials into the tumor cells, then a laser heats up the material which kills the <a href="https://www.earth.com/news/cancer-patients-medicinal-marijuana/">cancer</a> cells. 

But clinical application of PTT has been difficult because the nanomaterials are costly to produce and toxic. 

New research from the<a href="http://www.shca.org.cn/english"> Fudan University Shanghai Cancer Center</a> in China analyzed Hu-ink and compared it to the nanoparticles popularly used in PTT to see if the plant-based, natural ink could be used as a treatment option. 

Hu-ink is made of carbon and has good water stability, and these qualities are similar to the artificial nanoparticles currently used in PTT. 

After analyzing Hu-ink for its similarities, several experiments were conducted to test its effectiveness at targeting and treating cancer cells. The researchers found that the ink was extremely effective in PTT. 

When the Hu-ink was heated with a laser, the temperature rose by 131 degrees Fahrenheit and killed cancer cells in a laboratory dish. The researchers also tested PTT using Hu-ink on mice and found similar results. 

The exciting implications of this new research could create inexpensive and revolutionary treatments, building on PTT, for cancer metastasis. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com </a>Staff Writer

Traditional Chinese ink could be used as a cancer treatment

One of the greatest threats for cancer patients is metastasis,...

Over 1000 meters deep beneath the ocean off the coast of New Zealand lies an entire continent that’s barely been explored. Zealandia, named for its approximation to New Zealand, was an entire continental block first discovered in the 1970s.

Earlier this year, Zealandia was officially named the seventh of Earth’s continents, and researchers from the <a href="https://www.iodp.org/">International Ocean Discovery Program</a> (IODP) began a voyage to learn more. 

Zealandia as a treasure trove of data ranging back millions of years, but due to its extreme depth and remoteness, it’s been difficult to learn all that much about it. For researchers to collect any samples from Zealandia would require drilling beneath the seabed. 

The nine-week expedition aimed to fully explore Zealandia and acquire core samples of sediment from the continent. 

The expedition was comprised of 32 scientists from 12 countries who boarded the research vessel JOIDES Resolution, with funding from the <a href="https://www.nsf.gov/">National Science Foundation</a> (NSF).

To get samples, the research team drilled in six sites at depths over 4,000 feet and collected 8,202 feet of sediment cores. 

Zealandia is rich with climate information spanning millions of years, and the samples can help scientists understand tectonic plate formation, how the Earth’s continents formed, the migration of animals across the globe, and much more. 

“This expedition offered insights into Earth's history, ranging from mountain-building in New Zealand to the shifting movements of Earth's tectonic plates to changes in ocean circulation and global climate,” said Jamie Allan, the program director in the <a href="https://www.nsf.gov/div/index.jsp?div=OCE">U.S. National Science Foundation's Division of Ocean Sciences</a>. 

The researchers also found several hundred fossils of species showing that the continent was not always so deep below the Earth’s surface. 

The samples reveal much about Zealandia and early Earth, but the researchers also note that studying the submerged continent can help predict future <a href="https://www.earth.com/news/climate-change-volcanic-eruptions/">climate change</a> as well. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

A closer look at the sunken lost continent of Zealandia

Over 1000 meters deep beneath the ocean off the coast...

It had previously been estimated that modern humans first emerged in Africa 200,000 years ago. But now, new research has revealed that we may have been around even longer.

Through genome sequencing, researchers have found evidence that modern humans were present on Earth around 350,000 and 260,000 years ago.

The collaborative team of researchers from the <a href="https://www.uu.se/en">Uppsala University </a>in Sweden, and the <a href="https://www.uj.ac.za/">Universities of Johannesburg</a> and the <a href="https://www.wits.ac.za/">Witwatersrand</a> in South Africa published their findings in the journal Science. 

The team sequenced the genomes of seven individuals who lived in Southern Africa 23,000 to 300 years ago. The youngest of the individuals were genetically related to current-day Bantu-speaking South Africans. 

“This illustrates the population replacement that occurred in southern Africa,” said Carina Schlebusch, a population geneticist at Uppsala University and the study’s first author. 

Researchers have been able to map the emergence and evolution of <a href="https://www.earth.com/news/humans-still-evolving/">modern man</a> over time thanks to key paleontological discoveries of human fossils like the Omo and Herto, some of the oldest ever found.

The east Africa fossil record and the Omo and Herto fossils led researchers to believe that anatomically modern humans were present around 180,000 years ago. 

However, this new research from southern Africa indicates that modern humans emerged even earlier. 

“It now seems that at least two or three Homo species occupied the southern African landscape during this period, which also represents the early phases of the Middle Stone Age,” said Marlize Lombard, a Stone Age archaeologist at the University of Johannesburg.

The researchers also found that some of the individuals had genes that protected against malaria and sleeping sickness. The older individuals, present during the Stone Age, did not have this disease resistance. 

“This tells us that Iron Age farmers carried these disease-resistance variants when they migrated to southern Africa,” said Helena Malmström, one of the study’s co-authors.  

The results of the study also show that Homo sapiens did not originate in one specific place in Africa as previous theories have suggested. 

"Thus, both palaeo-anthropological and genetic evidence increasingly points to multiregional origins of anatomically modern humans in Africa, i.e., Homo sapiens did not originate in one place in Africa, but might have evolved from older forms in several places on the continent with gene flow between groups from different places," said Carina Schlebusch.

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Modern humans have walked the Earth for at least 300,000 years

It had previously been estimated that modern humans first emerged...

Planets generally form when materials collide together, and layer after layer is added to increase the mass and gravitational pull. It’s a volatile process, and atmospheres of vaporized rock and magma oceans are created when planetary bodies collide with each other at speeds of a few kilometers per second. As layers are added in a process known as accretion, elements are also lost. 

Scientists still debate if this is how all planets form, and many wonder if <a href="https://www.earth.com/news/sixth-mass-extinction-2100/">Earth</a> and Mars in particular come from a nearby nebula, or if they’re just a result of unique chaotic formations. 

Now, new research from the <a href="http://www.bristol.ac.uk/">University of Bristol</a> aims to settle this debate once and for all. The study, which was published in the journal Nature, explains that Earth and Mars underwent a similar process as they formed. 

During accretion, the composition of the planet changes drastically, and the collisions generate massive heat, but it’s unsustainable. Over time, as the planet increases its temporary silicate heavy atmosphere, materials are repeatedly released from the planet's gravitational pull. 

“We have provided evidence that such a sequence of events occurred in the formation of the Earth and Mars, using high-precision measurements of their magnesium isotope compositions.” said Dr. Remco Hin, leader of the research. 

Analyzing samples from Earth, meteorites from Mars, and samples from the asteroid Vesta, the researchers found all three contain magnesium isotope ratios unique to any nebula that could have contributed to early formation. 

The study also concluded that the Earth lost 40 percent of its mass during its construction as repeated episodes of vaporization occurred.

“This process seems common to planet building in general, not just for Earth and Mars, but for all planets in our Solar System and probably beyond, but differences in the collision histories of planets will create a diversity in their compositions,” said Hin.

The research sheds new light on the formation of planets and how each planet is composed. Looking more closely at the collision history of any planet will help map out its singular composition. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com </a>Staff Writer

How planets Earth and Mars may have been created

Planets generally form when materials collide together, and layer after...

A diet high in salt may be most commonly associated with high blood pressure and cardiovascular disease, but the reality is that the body needs salt to balance its water content, control blood pressure, and regulate cellular function. As the body loses salt, hormones are released in response to sodium deficiency. New research is unraveling the mystery of how these hormones influence the brain, causing increased salt cravings and consumption.

A team of scientists at the <a href="http://www.bidmc.org/">Beth Israel Deaconess Medical Center</a> (BIDMC) have  identified neurons that respond to the body's sodium deficiency. As a result, they managed to map the brain circuitry that drives salt-seeking behavior.

"We identified a specific circuit in the brain that detects sodium deficiency and drives an appetite specific for sodium to correct the deficiency," said co-author Jon M. Resch. "In addition, this work establishes that sodium ingestion is tightly regulated by the brain, and dysfunction in these neurons could lead to over- or under consumption of sodium, which could lead to stress on the cardiovascular system over time."

The team focused on a subset of neurons known as NTSHSD2. Through a series of experiments on sodium-deficient mice, the researchers managed to show that sodium deficiency activates these <a href="https://www.earth.com/news/chocolate-improve-brain-power/">neurons</a>. They also found that the presence of aldosterone, the hormone which is released during sodium deficiency, increases the response of these neurons.

"These neurons appear to be highly influenced by these hormones and less so by inputs from other neurons - though further study is warranted," said Resch. "This is a unique and very unexpected feature of these NTSHSD2 neurons."

Further evaluation of mice that were not deficient in sodium showed that the activation of NTSHSD2 neurons only triggered sodium consumption when there was a simultaneous signaling by another hormone released during sodium deficiency, angiotensin II. Because of this, the team established that NTSHSD2 neurons are not solely responsible for driving the sodium appetite. This second set of neurons, which have not yet been identified, most likely play a role in the drive for salt consumption as well.

"Several questions remain with regard to how sodium appetite works, but a major one is where ATII is acting in the brain and how the signal works in concert with NTSHSD2 neurons that respond to aldosterone," said Resch. "We have already begun work to help us close these gaps in our knowledge."

The research is published today in the journal <a href="http://www.cell.com/neuron/home">Neuron</a>.

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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

Finally some answers about where your salt cravings come from

A diet high in salt may be most commonly associated...

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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



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Flu viruses are more flexible than expected

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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



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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



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Kainji Lake in north central Nigeria

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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



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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



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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

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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



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Remote sensing will revolutionize the way we monitor trees

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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



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The city of Dublin on Ireland's east coast

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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



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Wetlands are a major source of methane emissions

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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



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The rapid retreat of the Columbia Glacier

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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



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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

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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

[sendtonews key="3UUsNkFOuS-2487333-12187" type="single"] Today's Video of the Day from NASA...

Earth,Like,Exoplanet,3d,Render

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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...