The term "aging" generally conjures up images of graying hair, slowing pace, and the eventual appearance of wrinkles. Yet, beyond these physical markers, aging is a fundamentally cellular and molecular process, even for organisms like bacteria, which also experience age-related changes.



From humble single-celled organisms to complex mammalian systems, all living organisms experience the impact of passing time, according to a recent report from the <a href="https://asm.org/" target="_blank" rel="noreferrer noopener">American Society for Microbiology</a>.



As they age, cells accumulate damage that impairs function, leading to numerous age-related disorders in humans. But what about bacteria? Can these single-celled entities feel the passage of time?



<h2 class="wp-block-heading" id="h-bacteria-age-and-binary-fission-factor">Bacteria age and binary fission factor</h2>



<a href="https://www.earth.com/news/bacteria-use-biological-clocks-to-predict-and-survive-cold-weather/" target="_blank" rel="noreferrer noopener">Bacteria</a>, being single-celled organisms, propagate differently from humans. Rather than sexual reproduction, they undergo a process known as binary fission. 



In this process, they duplicate their DNA and divide into two, resulting in rapid replication. Interestingly, the fastest-growing bacterium can split in less than 10 minutes.



Historically, it was believed that bacteria, thanks to binary fission's symmetrical nature, did not age. After all, this process results in a parent and offspring identical in age, leading to a concept dubbed "functional immortality."



Aging, it was assumed, required an asymmetric division where the parent is older than the offspring.



<h2 class="wp-block-heading" id="h-aging-of-bacteria">Aging of bacteria</h2>



Contrary to the longstanding belief, evidence emerged in 2005, suggesting that, like us, <a href="https://www.earth.com/news/bacteria-and-imprint-new-era-dna-transformation/" target="_blank" rel="noreferrer noopener">bacteria</a> do age. The researchers found that Escherichia coli (E. coli) exhibit differences between "old" and "new" (parent and offspring) cells.



These distinctions became evident as scientists watched the cells divide under a microscope, noting that older cells' growth rate and offspring production decline over time. 



Moreover, the senior cells died more frequently than their younger counterparts. Clearly, despite similar appearances, cells underwent divisions that left them functionally asymmetric and susceptible to aging.



<h2 class="wp-block-heading" id="h-asymmetry-to-the-rescue">Asymmetry to the rescue</h2>



So, how does this asymmetry help? It turns out, this type of division is crucial for the population's overall fitness. 



An asymmetric division maintains variance, the variety upon which natural selection acts. More variation typically means a better chance of survival under changing conditions.



One of the key players in this aging process is protein aggregation. This process occurs in bacteria and eukaryotic cells and is associated with age-related diseases in humans, such as Alzheimer's and Parkinson's, where harmful protein clumps can lead to cell death.



In <a href="https://www.earth.com/news/hungry-bacteria-will-devour-plastic-waste/" target="_blank" rel="noreferrer noopener">bacteria</a>, scientists found a smart way of dealing with this problem. As a feature of asymmetric division, older cells accumulate these proteins segregating age-related damage and keeping their offspring looking "younger" at the molecular level.



<h2 class="wp-block-heading" id="h-cellular-states-of-stress">Cellular states of stress</h2>



Another culprit contributing to aging, both in humans and bacteria, is stress. E. coli cells activate a stress state inside the cell to survive mutations accumulated over their lifetimes. 



Some of these mutations, while not lethal, can negatively impact the cell's fitness by causing a critical protein to lose its function.



In a study analyzing the effects of over 60 different nonlethal loss-of-function mutations in E. coli, researchers found that these mutants increased their metabolic activity to compensate for lost protein function. 



Still, this adaptation comes at a cost. These cells grow slower and enter a state similar to purgatory faster than non-mutants, especially in nutrient-poor environments.



The findings suggest an "aging cost" associated with maintaining resistance to stress on a population level. Could understanding bacterial aging lead us to new antibiotic targets? Might this ancient mechanism of aging shed light on certain human diseases perpetuated through cellular stress states?



<h2 class="wp-block-heading" id="h-complexities-of-aging">Complexities of aging</h2>



Time and age certainly doesn't stand still for anyone, humans and <a href="https://www.earth.com/news/how-soil-bacteria-contribute-to-atmospheric-co2/" target="_blank" rel="noreferrer noopener">bacteria</a> included. But perhaps bacteria's susceptibility to aging is a blessing in disguise. 



These hardy organisms make excellent subjects for studying the nuances of aging, given their rapid growth and the ability to observe numerous generations in a single experiment. After all, understanding the complexity of aging is inherent to unlocking the mysteries of life itself.



The discovery that bacteria are not eternal beings, as once thought, but vulnerable to aging like all living organisms, signifies the interconnectedness of life at every level.



The concept of time, aging, and the decline in function straddle across the biological spectrum, making it possible to draw parallels between the simplest life forms and the most complex ones.



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Do bacteria age or are they immortal?

The term "aging" generally conjures up images of graying hair, slowing pace, and the eventual appearance of wrinkles. Yet, beyond these physical markers, aging is a fundamentally cellular and molecular process, even for organisms like bacteria, which also experience age-related changes. From humble single-celled organisms to complex mammalian systems, all living organisms experience the impact of passing time, according to a recent report from the American Society for Microbiology. As they age, cells accumulate damage that impairs function, leading to numerous age-related disorders in humans. But what...

In just 25 years, global light pollution has increased by at least 49 percent, according to a new study led by the <a href="https://www.exeter.ac.uk/">University of Exeter</a>. Considering that this estimate is based only on <a href="https://www.earth.com/news/light-pollution-may-be-driving-the-decline-of-moths/">light</a> that is visible to satellites, the researchers are confident that the true figure is much higher. 



The experts speculate that from 1992 to 2017, global light pollution increased by up to 270 percent, with regional increases of up to 400 percent.



Even though the trends vary by region, light pollution emissions have increased almost everywhere and there is "limited evidence" that improved technology has helped.



"The global spread of artificial light is eroding the natural night-time environment," said first author Dr.&nbsp; Alejandro Sánchez de Miguel of the Environment and Sustainability Institute on Exeter's Penryn Campus in Cornwall.



"This study provides clear evidence not only of how bad light pollution has become as a global problem, but also that it is continuing to get worse, and probably at a faster and faster rate."



The researchers said that their work highlights the hidden impact of the transition to solid-state light emitting diode (LED) technology. LEDs emit more blue light, which is undetectable to satellite sensors.



The study results show that light pollution is steadily increasing in Asia, South America, Oceania, and Africa. Light pollution appears to have declined in North America and leveled off in Europe. However, the researchers say the shift toward blue-rich LEDs masks the fact that light pollution has increased in most locations.



"To take the UK as an example, if you ignore the effect of the switch to LEDs - which has been extensive - you get the false impression that light pollution has recently declined," said Dr. Sánchez de Miguel. "However, correcting for this effect shows it has really increased, and potentially very markedly."



"Contrary to popular belief, the installation of 'broad white' LED streetlights, whilst potentially providing some energy savings, has increased light pollution and also the impacts on organisms such as moths."



A growing collection of research shows that artificial light at night has major impacts on the natural environment. Light pollution from street lamps and other sources is likely contributing to the widespread decline of insects.&nbsp;



"Over the past 25 years, the transition to solid-state LED lighting has been accompanied by rapid increases in light pollution globally," said Ruskin Hartley, Executive Director of the International Dark-Sky Association.



"Without concerted action to reverse this trend, the impact on the natural environment will accelerate, further exacerbating the biodiversity crisis, wasting energy, and meaning a whole generation will grow up in perpetual twilight."



The study is published in the journal <a href="https://www.mdpi.com/journal/remotesensing">Remote Sensing</a>.



---



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

Light pollution has increased almost everywhere

In just 25 years, global light pollution has increased by...

Human heart rate fluctuates due to many different factors. We know that practices such as meditation can slow down heart rate, while <a href="https://www.earth.com/news/exercise-can-improve-heart-health-at-any-age/">exercising</a>, thinking about a frightening experience or watching a riveting movie can speed it up. If we carry out these activities with other people then it is predictable that they will experience the same changes in heart rate as we do.



However, the authors of a new study, published in the journal <a href="https://www.cell.com/cell-reports/home">Cell Reports</a>, propose that individuals listening attentively to a story will synchronize their heart rates as well – even though they are listening entirely on their own.&nbsp;



“There's a lot of literature demonstrating that people synchronize their physiology with each other. But the premise is that somehow, you're interacting and physically present in the same place,” explained study co-senior author Lucas Parra, a professor at City College of New York. “What we have found is that the phenomenon is much broader, and that simply following a story and processing stimulus will cause similar fluctuations in people’s heart rates. It's the cognitive function that drives your heart rate up or down.”



“What’s important is that the listener is paying attention to the actions in the story,” noted study co-senior author Jacobo Sitt, a researcher at the Paris Brain Institute and Inserm. “It’s not about emotions, but about being engaged and attentive, and thinking about what will happen next. Your heart responds to those signals from the brain.”



In a series of experiments the researchers investigated the role of attention in synchronizing the heart rates of participants. For example, when volunteers listened to an audiobook of Jules Verne’s 20,000 Leagues Under the Sea, their heart rates increased and decreased at similar points during the story. The electrocardiogram (EKG) measurements of their heart rates were synchronized over time, even though they were isolated from one another.



In order to prove that synchronization was not occurring because participants were responding to the emotional content of the narrative, the researchers asked participants to watch short, unemotional educational videos. Participants who watched the videos showed synchronization of their heart rates, despite the lack of emotional content.&nbsp;



But participants who had to count backwards in their heads while watching the videos showed less synchronization of emotions. This indicated to the researchers that it is the act of paying attention to the narrative and thinking about it that is important in synchronizing heart rates.



Further experimentation revealed that heart rate synchronization also predicts how well a participant comprehends and remembers the events of the story. When participants listened to children’s short stories, some while attentive and others while being distracted, those with higher heart rate synchronization achieved better scores when questioned later about the story. The authors felt this was evidence of the relationship between changes in heart rate and the conscious processing of the narrative.&nbsp;



In a final experiment healthy volunteers and patients with disorders of consciousness (e.g., in a coma or a persistent vegetative state) listened to an audiobook of a children’s story. Patients with disorders were unable to pay attention and, as expected, showed lower rates of heart synchronization than did healthy participants.&nbsp;&nbsp;



“This study is still very preliminary, but you can imagine this being an easy test that could be implemented to measure brain function,” said Sitt. “It doesn’t require a lot of equipment. It could even be performed in an ambulance on the way to the hospital.” The study authors emphasized that more validation is needed, with larger numbers of patients, as well as comparisons with accepted tests of brain function like EEGs and fMRIs, before this method could be accepted as a useful measure of brain function.&nbsp;



According to Parra, such research is also important for understanding mindfulness and the brain-body connection.&nbsp;



“Neuroscience is opening up in terms of thinking of the brain as part of an actual anatomical, physical body. This research is a step in the direction of looking at the brain-body connection more broadly, in terms of how the brain affects the body.”



---



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

Our heart rates synchronize when we experience the same story

Human heart rate fluctuates due to many different factors. We...

A new study suggests that all 4,000 species of snakes populating the Earth today evolved from a just a few species which survived the devastating asteroid impact that wiped out the <a href="https://www.earth.com/news/shark-diversity-survived-the-dinosaur-extinction/">dinosaurs</a> and most other animals at the end of the Cretaceous.



By studying fossils and analyzing genetic differences between modern snakes, the researchers reconstructed snake evolution. They propose that snakes’ ability to hide underground and live for long periods with very little food played a key role in their ability to survive the giant asteroid impact that destroyed much of the Earth’s fauna 66 million years ago. In the aftermath of this catastrophic event, snakes moved into new niches and habitats, and began diversifying.&nbsp;



"It's remarkable, because not only are they surviving an extinction that wipes out so many other animals, but within a few million years they are innovating, using their habitats in new ways," said study lead author Dr Catherine Klein from <a href="https://www.fau.eu/">Friedrich-Alexander-Universität Erlangen-Nürnberg</a> (FAU) in Germany.



The research suggests that although the ancestor of modern snakes probably lived in the Southern Hemisphere in the aftermath of the asteroid impact, snakes appear to have spread to Asia. From there, snakes moved all over the globe, with a large number of new species emerging and evolving.



&nbsp;“Our research suggests that extinction acted as a form of ‘creative destruction’- by wiping out old species, it allowed survivors to exploit the gaps in the ecosystem, experimenting with new lifestyles and habitats,” explained corresponding author Dr. Nick Longrich from the&nbsp;<a href="https://www.bath.ac.uk/research-centres/milner-centre-for-evolution/">Milner Centre for Evolution</a>&nbsp;at the University of Bath.&nbsp;&nbsp;



“This seems to be a general feature of evolution - it’s the periods immediately after major extinctions where we see evolution at its most wildly experimental and innovative. The destruction of biodiversity makes room for new things to emerge and colonize new landmasses. Ultimately life becomes even more diverse than before.”



The scientists also found evidence for another major diversification event that occurred during that period – the shift from a warm to a cold climate, when polar ice caps formed and the Ice Age began.&nbsp;



This study, published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications</a>, foregrounds the importance of severe, rapid, and global environmental disruptions in driving evolutionary change.&nbsp;&nbsp;&nbsp;



---



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

Modern snakes evolved from just a few surviving species

A new study suggests that all 4,000 species of snakes...

A recent study from the <a href="https://www.cam.ac.uk/">University of Cambridge</a> found that flowers are employing “mechanical buckling,” a term that signifies the deformation of a structural component under load. The flowers are using this strategy to produce three-dimensional, iridescent patterns that can lure <a href="https://www.earth.com/news/green-spaces-provide-a-refuge-for-urban-pollinators/">pollinators</a>. 



Although in civil engineering buckling is typically associated with mechanical failure and is something that engineers try to avoid at all costs, for flowers, this phenomenon is surprisingly employed to their advantage.&nbsp;



Flowers use a variety of strategies to attract pollinators, including not only the well-known employment of chemical color from pigments, but also the less-known phenomenon of iridescence – the optical effect produced by an intricate pattern of microscopic ridges on the surface of petals that diffract light. The scientists discovered that hibiscus flowers employ buckling to alter the deformations of the surface of petals in order to produce iridescence.&nbsp;



“The petal striations on hibiscus flowers develop during petal growth, and&nbsp;Professor Beverley Glover’s team, who were the first to discover the iridescence properties in flowers, suspected that they may be caused by mechanical properties as the petals expanded," explained study lead author&nbsp;Dr. Sarah Robinson&nbsp;from the University of Cambridge’s <a href="https://www.slcu.cam.ac.uk/">Sainsbury Laboratory</a>.



By using a robotic system developed to measure mechanical properties in plants, Dr. Robinson and her colleagues applied a certain force to stretch immature hibiscus petals which have not yet developed striations to check whether it was possible to mechanically induce the patterns.



“We saw striations appear almost instantaneously when a mechanical stress was applied. This told us that it was buckling that was causing a wrinkling of the petal surface and not a slower biological process," explained Dr. Robinson. "We were able to measure the striations and show that they had the same properties as they do when they develop naturally.&nbsp;



"One of the big surprises was that we could also induce striations at 90 degrees to the striations that naturally occur, which indicates that the orientation of the striations is not pre-patterned. However, we could not induce striations in other parts of the petals, suggesting that the ability to form striations is under genetic control."



Considering that more than 35 percent of the world’s crop harvests rely on animal pollinators, it is of crucial importance to gain a better understanding of how the relationship between plants and pollinators functions. This study, published in the journal <a href="https://www.cell.com/cell-reports/fulltext/S2211-1247(21)01164-5?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2211124721011645%3Fshowall%3Dtrue">Cell Reports</a>, is a major step forward in elucidating this mysterious connection. 



---



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

Flowers use mechanical buckling to lure pollinators

A recent study from the University of Cambridge found that...

A new study published in American Heart Association’s journal <a href="https://www.ahajournals.org/journal/hyp">Hypertension</a> found that elevated levels of stress hormones increase the risk of developing hypertension and other <a href="https://www.earth.com/news/green-spaces-linked-to-lower-rates-of-heart-disease/">cardiovascular</a> problems.



The researchers measured levels of norepinephrine, epinephrine, and dopamine (neurotransmitters known as catecholamines, which have a fundamental role in maintaining the stability of the autonomous nervous system), as well as cortisol (a steroid hormone regulated by the hypothalamic-pituitary-adrenal axis, which modulates stress response). The analysis was focused on 412 participants between the ages of 48 to 87 years who had normal blood pressure at the beginning of the study.&nbsp;



“Although all of these hormones are produced in the adrenal gland, they have different roles and mechanisms to influence the cardiovascular system, so it is important to study their relationship with hypertension and cardiovascular events, individually,” said study lead author Kosuke Inoue, an assistant professor of Social Epidemiology at the <a href="https://www.kyoto-u.ac.jp/en">University of Kyoto</a> in Japan.&nbsp;



Between 2005 and 2018, participants were followed by three more visits to assess whether they experienced any subsequent cardiovascular problems. The scientists discovered that during a follow-up period of 6.5 years, each time the levels of the stress hormones doubled, there was a 21 to 31 percent increase in the risk of developing hypertension.&nbsp;



Furthermore, during a follow-up period of 11.2 years, each doubling of the cortisol levels triggered a 90 percent increase in the risk of experiencing cardiovascular events.



“The stress hormones norepinephrine, epinephrine, dopamine and cortisol can increase with stress from life events, work, relationships, finances and more. And we confirmed that stress is a key factor&nbsp;contributing&nbsp;to the risk of hypertension and cardiovascular events,”&nbsp;said Professor Inoue.&nbsp;



“Previous research focused on the relationship between stress hormone levels and hypertension or cardiovascular events in patients with existing hypertension. However, studies looking at adults without hypertension were lacking."



“It is important to examine the impact of stress on adults in the general population because it provides new information about whether routine measurement of stress hormones needs to be considered&nbsp;to prevent hypertension and CVD events.”



---



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

Elevated stress hormones raise the risk of heart problems

A new study published in American Heart Association’s journal Hypertension...

New research by neuroscientists has revealed that a single brain cell can both sense the environment and control foraging behavior. The study, which used computer modeling to examine a small roundworm called a nematode, was published in the journal <a href="https://www.nature.com/commsbio/">Communications Biology</a>. 



The scientists found that the same cells that sense the environment - in this case, cells that sense salt in microscopic nematodes (Caenorhabditis elegans) - also control decision making.&nbsp;



“Our findings are startling – we found simple mechanisms by which salt tasting cells drive a rather sophisticated strategy to forage for food," said study co-lead author Professor Netta Cohen.



"When a nematode first senses a salty environment, the sensory cell that is sensitive to increasing salt concentrations is stimulated - and provides all the information the animal needs to steer into the salt patch."



"We think this is a mechanism built into these sensory cells. Not only is it remarkably effective, but surprisingly, because it all takes place inside the sensors, it is very easy to implement with the basic toolkit that nearly all brain cells have at their disposal."&nbsp;&nbsp;&nbsp;



The nematodes have only 302 cells altogether, including two cells that sense salt - one activated by increased levels of salt, the other turned on by decreased levels of salt. Together these cells can steer the animal towards salt. Although in some ways nematodes are simple animals, the scientists suspect that other animals may use a similar mechanism for food searches.



“We think this is a mechanism built into these sensory cells. Not only is it remarkably effective, but surprisingly, because it all takes place inside the sensors, it is very easy to implement with the basic toolkit that nearly all brain cells have at their disposal," said Professor Cohen.



While C. elegans may use salt cues to forage for food, we suspect similar mechanisms may be used by other animals to selectively attend to other cues or features of the environment."



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

Taste cells may control foraging and decision making

New research by neuroscientists has revealed that a single brain...

A team of experts at the Hudson Alpha Institute for Biotechnology has identified the gene that is responsible for tiger stripes, leopard spots, and other fur patterns found in cats. The colors and fur patterns that cats are born with are the same markings they will have for life.&nbsp;



"From leopards to giraffes to zebras, the developmental biology of self-organizing color pattern in mammals is an unsolved mystery," said Professor Gregory Barsh. "Tigers with black stripes on an orange or white background roam the grasslands of Southeast Asia and India."



"Spotted cheetahs chase antelope through the shrubland in Africa. Jaguars with their rosette patterned coats stalk down prey throughout South and Latin America. And domesticated cats of many coat colors and patterns bask in the sunlight of living rooms across the world."



For their investigation, the researchers analyzed skin samples from non-viable cat embryos at different stages of development.



The genetic analysis of single cells and proteins in the tissue showed that a signaling molecule encoded by the gene Dkk4 plays a central role in determining cat fur patterns, including their shape and color. As the embryo develops, the expression of this molecule drives unique fur patterns that emerge in cats during hair growth.&nbsp;



“Intricate color patterns are one aspect that defines morphological diversity in cats,” said Professor Barsh. He noted that early in development, his team identified strip-like alterations in the thickness of the epidermis preceded by a pre-model of gene expression.



"Our findings lead to a molecular understanding of how the leopard got its spots. They suggest similar mechanisms underpinning the periodic color pattern and hair follicle spacing and identify targets for different variations of the pattern in other mammals."



Dr. Chris Kaelin, a senior scientist at Alpha Hudson, explained that the study has identified a network of molecules involved in pattern formation. "Several of the molecules, including Dkk4, are known to function coordinately as activators and inhibitors, exactly as Alan Turing predicted 70 years ago."



According to Dr. Kelly McGowan, the findings suggest that even before pigment producing melanocyte cells enter the epidermis, the cells are predestined to signal for a specific fur color.



"Our results bring molecular understanding to how the leopard got its spots, suggest that similar mechanisms underlie periodic color pattern and periodic hair follicle spacing, and identify targets for diverse pattern variation in other mammals," wrote the study authors.



The study is published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications</a>.



---



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

Experts have solved the mystery of fur patterns in cats

A team of experts at the Hudson Alpha Institute for...

A new study from <a href="https://www.cnrs.fr/">CNRS</a> is describing how cyclones are to blame for the deaths of thousands of seabirds each year in the North Atlantic. According to the researchers, high-intensity cyclone activity in the North Atlantic causes the seabirds to starve. Seabirds are often exposed to the cyclones, which can last several days, when they migrate south from their <a href="https://www.earth.com/news/arctic-warming-will-cause-extreme-cooling-elsewhere/">Arctic</a> nesting sites.&nbsp;



"Each winter, the North Atlantic Ocean is the stage for numerous cyclones, the most severe ones leading to seabird mass-mortality events called 'winter wrecks.' During these, thousands of emaciated seabird carcasses are washed ashore along European and North American coasts," explained the study authors.



"Winter cyclones can therefore shape seabird population dynamics by affecting survival rates as well as the body condition of surviving individuals and thus their future reproduction. However, most often the geographic origins of impacted seabirds and the causes of their deaths remain unclear."



To investigate, the researchers used trackers to monitor 1,500 birds of five main species including Atlantic puffins, little auks, black-legged kittiwakes, and two species of guillemots.



The winter tracking data made it possible for the scientists to compare seabird movements with the trajectories of cyclones and determine the degree of exposure.



Surprisingly, the experts found that seabirds were not dying from increased energy expenditure. Instead, the birds were struggling due to their inability to feed during a cyclone.&nbsp;



The seabird species that were monitored for the study are particularly unsuited to fly in high winds and some cannot dive into a stormy sea, which prevents them from feeding. The birds starve when the unfavorable conditions persist for a few days beyond the food that the birds have stored in their body.&nbsp;



"We demonstrated that cyclones of high intensity impacted birds from all studied species and breeding colonies during winter but especially those aggregating in the Labrador Sea, the Davis Strait, the surroundings of Iceland, and the Barents Sea," wrote the study authors.



"Our broad-scale analyses suggested that cyclonic conditions do not increase seabird energy requirements, implying that they die because of the unavailability of their prey and/or their inability to feed during cyclones."



The study is published in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>.



---



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

Cyclones kill thousands of seabirds each year

A new study from CNRS is describing how cyclones are...

Farming cows has its disadvantages, particularly when it comes to disposing of the waste they produce. If cows range freely in the fields, their waste soon accumulates and contaminates soil and nearby waterways. If cows are kept in a barn instead, then the combination of their urine and feces produces ammonia, which is an undesirable gas.



Ammonia from cow waste is not a greenhouse gas, nor does it contribute directly to climate change. But when it leaches into the soil it is converted into nitrous oxide by microbes that reside in the soil. Nitrous oxide is the third most important greenhouse gas. Livestock farming is a major source of ammonia and, by implication, an indirect source of nitrous oxide.&nbsp;



In an article published in the journal <a href="https://www.cell.com/current-biology/home">Current Biology</a>, a team of scientists attempted to teach calves to control their natural urination and defecation impulses and make use of a latrine. They reasoned that if excreta could be collected in a specific place (the latrine) then this would facilitate easy handling, treatment and disposal, which would lead to cleaner barns, reduction in ammonia emissions and the creation of more open, animal-friendly farms.&nbsp;



“It’s usually assumed that cattle are not capable of controlling defecation or urination,” said co-author Jan Langbein, an animal psychologist at the Research Institute for Farm Animal Biology (FBN) in Germany. “Cattle, like many other animals or farm animals are quite clever and they can learn a lot. Why shouldn’t they be able to learn how to use a toilet?”



The research team, consisting of scientists from FBN, FLI (Germany) and the University of Auckland (New Zealand) used both positive and negative reinforcement when attempting to potty-train16 calves. They termed the process MooLoo training.



Initially, the calves were kept in the latrine area and rewarded each time they urinated. When the calves had learned to associate urination in the latrine with a reward, the researchers allowed the calves to enter the latrine of their own volition whenever they needed to urinate. Once again, calves that behaved appropriately were rewarded. In addition, those individuals urinating outside the latrine were exposed to an unpleasant and discouraging experience.



“As a punishment we first used in-ear headphones and we played a very nasty sound whenever they urinated outside,” said Langbein. “We thought this would punish the animals - not too aversively - but they didn’t care. Ultimately, a splash of water worked well as a gentle deterrent.”



After a few weeks, 11 of the 16 calves had successfully learned to use a latrine. This is a complex process for calves and involves self-control, an awareness of a full bladder, the ability to override natural excretory reflexes, the selection of a latrine and, lastly, the conscious relaxation of the sphincter muscles to allow urination. The researchers were impressed that the calves showed a level of learning comparable to that of children during potty-training



Now that they have had success in training calves to use a latrine, the researchers want to test their training system on real cattle farms, both those that use indoor housing and those where cows are kept outside. Langbein says he hopes that in a few years, all cows will go to a toilet.



---



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

Toilet training cows may reduce ammonia emissions

Farming cows has its disadvantages, particularly when it comes to...

The,Starry,Night,,,Art,Painting,Oil,Color,Moon,Mountain

A recent study published in the journal <a href="https://www.nature.com/articles/s41467-021-25477-8">Nature Communications</a> has proposed a new theory to explain innovation in arts and sciences. By using artificial intelligence to mine big data, researchers from the <a href="https://www.kellogg.northwestern.edu/">Kellogg School of Management</a> at Northwestern University discovered a pattern of creative exploration followed by exploitation that generally led to artists’ and scientists’ most successful breakthroughs.



Jackson Pollock, for instance, spent years drawing, printmaking, and painting surrealist pictures of humans, nature, and animals, before developing his unique “drip technique,” which brought him world fame. Similarly, Vincent Van Gogh painted a series of somber, realistic pictures before experiencing his artistic breakthrough from 1888-1890, during which he painted his most innovative works.&nbsp;&nbsp;



“If you look at his production before 1888, it was all over the place,” said lead author Dashun Wang, director of the <a href="https://www.kellogg.northwestern.edu/research/science-of-science.aspx">Center of Science &amp; Innovation</a> at Northwestern University. “It was full of still-life paintings, pencil drawings and portraits that are much different in character from the work he created during his hot streak.”



As Professor Wang and colleagues explained in a previous <a href="https://www.nature.com/articles/s41586-018-0315-8">study</a>, hot streaks highlight specific periods during which an individual’s performance is substantially better than his or her typical performance. In their new study, by analyzing data from 2,128 visual artists, 4,337 film directors, and 20,040 scientists, Wang and his team discovered that hot streaks emerge from years of exploration (painstaking study of diverse topics and styles), followed by a period of exploitation (focus on a narrow area to develop deep expertise).



“Neither exploration nor exploitation alone in isolation is associated with a hot streak. It’s the sequence of them together,” explained Wang.&nbsp;



“Although exploration is considered a risk because it might not lead anywhere, it increases the likelihood of stumbling upon a great idea. By contrast, exploitation is typically viewed as a conservative strategy."&nbsp;



"If you exploit the same type of work over and over for a long period of time, it might stifle creativity. But, interestingly, exploration followed by exploitation appears to show consistent associations with the onset of hot streaks.”&nbsp;



According to co-author Jillian Chown, an assistant professor of management and organizations at the Kellogg School of Management, identifying this universal pattern across creative domains “can help individuals and organizations understand the different types of activities to engage in - such as exploring new domains or exploiting existing knowledge and competencies - and the optimal sequence to use in order to achieve the most significant impact.”



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

Experts discover a pattern that drives artistic breakthroughs

A recent study published in the journal Nature Communications has...

The traditional energy-balance model teaches us that the maintenance of body weight is achieved by balancing the calories we consume with the energy we expend. This philosophy underlies the USDA’s Dietary Guidelines for Americans 2020-2025 which state that losing weight requires adults to reduce the number of calories they get from <a href="https://www.earth.com/news/reducing-sugar-in-packaged-foods-can-prevent-disease-in-millions/">foods</a> and beverages and increase the amount expended through physical activity.



According to this approach, losing weight should be a simple matter of reducing the amount we eat and increasing the extent of physical activity. Despite decades of public health warnings, however, levels of obesity continue to rise.&nbsp;&nbsp;



The Centers for Disease Control and Prevention state that more than 40 percent of adult Americans are currently affected by obesity, despite the apparently simple solution proposed by the energy-balance model.&nbsp;&nbsp;&nbsp;



The authors of a recent study from the <a href="https://nutrition.org/">American Society for Nutrition</a> propose that a different model, the carbohydrate-insulin model, better explains the metabolic origins of weight gain and obesity. This model is not new - ir was developed in the early 1900s - but the recent study summarizes the current scientific evidence that supports it. The research is authored by 17 internationally recognized scientists, public health experts and clinical researchers. 



According to lead author Dr. David Ludwig, an endocrinologist at Boston Children’s Hospital and professor at Harvard Medical School, the energy-balance model doesn’t help us understand the&nbsp;biological&nbsp;causes of weight gain. “During a growth spurt, for instance, adolescents may increase food intake by 1,000 calories a day. But does their overeating cause the growth spurt or does the growth spurt cause the adolescent to get hungry and overeat?”



In contrast to the "calorie in, calorie out" approach of the energy-balance model, the carbohydrate-insulin model proposes that obesity is not caused by overeating but rather by the quality of the food we eat. In particular, our modern diets that contain a high glycemic load are to blame for the obesity pandemic. Glycemic load is a measure of the amount that a food will raise the blood sugar level after it is eaten. Foods that have a high glycemic load include those with high levels of easily digestible refined starch and sugar.&nbsp;



According to the carbohydrate-insulin model, the consumption of foods with a high glycemic load leads to an increase in the secretion of insulin, a hormone that normally helps remove sugar from the blood and store it in liver and muscle cells. In the case of high levels of insulin, however, the fat cells are stimulated to increase their storage of calories, leading to enhanced deposition of body fat. This also leaves lower levels of sugar in the blood and leads to feelings of hunger. Ironically, the body may feel it is starved of energy and respond by slowing down the metabolic rate.&nbsp;



Acceptance of the carbohydrate-insulin model necessitates a whole new way of approaching the management of weight and the treatment of obesity. Instead of limiting calorie intake or increasing energy expenditure, strategies that have not been particularly successful in the past, we should focus on what we eat and on how specific foods affect our hormone levels and metabolism.&nbsp;



"Reducing consumption of the rapidly digestible carbohydrates that flooded the food supply during the low-fat diet era lessens the underlying drive to store body fat," said Dr. Ludwig. "As a result, people may lose weight with less hunger and struggle.”&nbsp;



Foods with high glycemic loads should be replaced with non-starchy vegetables, legumes, whole fruits and intact whole grains, all of which tend to have a moderate or low glycemic load.



The study is published in <a href="https://academic.oup.com/ajcn">The American Journal of Clinical Nutrition</a>.



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By Alison Bosman, Earth.com Staff Writer

It’s not overeating, but what we eat, that causes weight gain

The traditional energy-balance model teaches us that the maintenance of...

Looking at the <a href="https://www.earth.com/news/95-percent-of-ocean-could-become-inhospitable-this-century/">ocean</a> and other "blue spaces" can instantly improve your body image, according to a recent study led by Professor Viren Swami of <a href="https://aru.ac.uk/international/english-language-support">Anglia Ruskin University</a>. The researchers found that after looking at pictures of seascapes, study participants felt significantly better about their appearance.



Images of green landscapes were also linked to healthier body image, but the effect was found to be much stronger when individuals were presented photographs of blue spaces including the sky or the ocean.&nbsp;



In a previous study published in the journal Body Image, Professor Swami explained that there are several reasons why exposure to nature could help people feel happier about their bodies.



"It might be that it distances people, physically and mentally, from appearance-focused situations that are one of the causes of negative body image," said Professor Swami. "It is also possible that exposure to environments with depth and complexity restricts negative appearance-related thoughts."&nbsp;



"More specifically, natural environments effortlessly hold your attention - a process known as 'soft fascination.' This is often accompanied by feelings of pleasure, such as when you are drawn to the sight of a setting sun."



"An environment that does not require undivided attention may provide people with cognitive quiet, which in turn may foster self-compassion such as respecting your body and appreciating it is part of a wider ecosystem requiring protection and care."



"Access to nature may also mean that individuals spend more time outdoors engaging in activities that focus attention on the body's functionality rather than aesthetics."



The current study was focused on 168 volunteers who were assigned to one of three groups. The first group was presented with high-resolution images of green spaces, the second group was shown blue spaces, and the third group viewed pictures of buildings.



Before and after viewing the photographs, the participants completed a questionnaire to measure their body appreciation. The volunteers agreed or disagreed with statements such as “Right now, I respect my body."



Professor Swami said that given the fact that not everyone has access to nature, it is important to find ways of bringing nature to everyone.



“Our study shows it may be possible to develop low-cost intervention programs by using images of the natural world. These programs could promote healthier body image across diverse populations, including those with limited access to real nature perhaps due to health reasons or where they live.”



The results of the study were presented at the British Science Festival in Chelmsford.&nbsp;



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By Chrissy Sexton, Earth.com Staff Writer

Looking at blue spaces can instantly improve body image

Looking at the ocean and other "blue spaces" can instantly...

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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

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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



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

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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

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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

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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

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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



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

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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

[sendtonews key="6HyfrAJTBI-1831843-12187" 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.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...