For years, it was widely believed that waking up triggered an immediate release of cortisol, the stress hormone. 



This response, known as the cortisol awakening response (CAR), has been used in clinical studies. However, new research from the University of Bristol reveals that this common assumption might be incorrect.



The study suggests that cortisol levels actually increase in the hours before waking up, not immediately upon waking. The research challenges previous conclusions that linked cortisol release directly to the awakening process.



<h2 class="wp-block-heading" id="h-cortisol-awakening-response">Cortisol awakening response</h2>



Previous studies have relied on the concept of CAR to evaluate how the body responds to <a href="https://www.earth.com/news/holiday-stress-is-higher-this-year-compared-to-2023/" target="_blank" rel="noreferrer noopener">stress</a> in conditions like PTSD, depression, and obesity. The CAR assumes that cortisol, a stress hormone, spikes right after waking as a natural response to the stress of starting the day.



However, these earlier studies focused only on measuring cortisol levels in saliva after the person had already woken up, missing an important part of the process - the time before waking. This left an incomplete picture of how cortisol levels change during the sleep-to-wake transition.



To address this gap, researchers at the <a href="https://www.bristol.ac.uk" target="_blank" rel="noreferrer noopener">University of Bristol</a> designed a study to measure cortisol levels both before and after waking. Instead of relying on post-wake saliva samples, they used an automated sampling system to track cortisol in 201 participants aged 18 to 68.



This allowed them to analyze the <a href="https://www.earth.com/news/stress-eats-away-our-brains-cognitive-defenses/" target="_blank" rel="noreferrer noopener">full pattern</a> of cortisol secretion, including the changes that occur before waking up.



<h2 class="wp-block-heading" id="h-cortisol-does-not-spike-after-waking">Cortisol does not spike after waking</h2>



The results were surprising. The study found no evidence that cortisol secretion increases immediately after waking. In fact, there was no significant difference in the rate of cortisol increase during the hour after waking compared to the hour before waking.



“We found that any changes in cortisol around the time of awakening are more likely to be the tail end of the daily rhythm,” said Stafford Lightman, professor of medicine at Bristol Medical School and one of the study’s lead authors.



This rhythm begins in the early hours of the morning and peaks shortly after habitual wake time.



<h2 class="wp-block-heading" id="h-role-of-circadian-rhythms">Role of circadian rhythms</h2>



The study also uncovered substantial variability in cortisol concentration and its rate of change among individuals. 



Factors such as sleep length and timing seemed to influence these differences. The researchers cautioned that interpreting cortisol values solely based on post-wake measurements could be misleading.



Dr. Thomas Upton, clinical research fellow and co-lead author, emphasized the importance of considering both pre- and post-wake cortisol levels in future studies.



"Much caution should be exercised if attempting to interpret post-wake cortisol values where information about the pre-waking state is not known," he explained.



The findings also stress the importance of circadian rhythms, the body’s natural 24-hour cycles, in <a href="https://www.earth.com/news/stress-is-contagious-and-this-applies-to-animals-too/" target="_blank" rel="noreferrer noopener">regulating cortisol</a>. "Cortisol changes around waking are more about the body's internal rhythms than a response to awakening," said Lightman.



<h2 class="wp-block-heading" id="h-implications-for-health-conditions">Implications for health conditions</h2>



The research offers valuable insights into the role of cortisol in sleep disorders, <a href="https://www.earth.com/news/social-stress-harms-the-brains-of-low-status-fish/" target="_blank" rel="noreferrer noopener">depression</a>, and other conditions. 



“Our study opens up a whole new framework for understanding the relationship of overnight increases in cortisol with sleep,” Lightman said.



Marcus Munafò, professor of biological osychology at the University of Bristol, noted that this study challenges “received wisdom” in research and stresses the importance of rigorously testing previous findings.



Professor Munafò also highlighted the significance of the study in understanding the biology of sleep-wake cycles.



<h2 class="wp-block-heading" id="h-future-research-on-stress-hormones">Future research on stress hormones</h2>



The researchers suggest that future studies on sleep and arousal should examine the dynamic changes in the hypothalamic-pituitary axis, which regulates cortisol release. 



Understanding how sleep affects cortisol secretion could lead to better insights into various health conditions and improve treatment strategies.



The study was funded by the EU Horizon 2020 grant ‘Ultradian’ and the Biotechnology and Biological Sciences Research Council (<a href="https://www.ukri.org/who-we-are/bbsrc/" target="_blank" rel="noreferrer noopener">BBSRC</a>).



Ultimately, the new findings encourage a reassessment of the cortisol awakening response and emphasize the complexity of cortisol <a href="https://www.earth.com/news/mindfulness-protects-against-work-stress-burnout/" target="_blank" rel="noreferrer noopener">regulation</a>.



Researchers will need to consider both pre-wake and post-wake cortisol levels to gain a fuller understanding of how this hormone interacts with sleep, health, and behavior.



The study is published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2024.1844" target="_blank" rel="noreferrer noopener">Proceedings of the Royal Society B Biological Sciences</a>.



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Stress hormones rise during sleep to prepare your body for the day

For years, it was widely believed that waking up triggered an immediate release of cortisol, the stress hormone. This response, known as the cortisol awakening response (CAR), has been used in clinical studies. However, new research from the University of Bristol reveals that this common assumption might be incorrect. The study suggests that cortisol levels actually increase in the hours before waking up, not immediately upon waking. The research challenges previous conclusions that linked cortisol release directly to the awakening process. Cortisol awakening response Previous studies have...

There are many benefits to sharing a meal with others including a <a href="https://www.earth.com/news/eating-alone-bad-health/">decreased risk of obesity</a> and better academic performance <a href="https://www.washingtonpost.com/posteverything/wp/2015/01/12/the-most-important-thing-you-can-do-with-your-kids-eat-dinner-with-them/?utm_term=.9c15734b31cf">among children and teens</a> who have regular, shared meal times. 

Now, a new study has found another benefit to sharing not just a meal, but a plate, as is customary in Chinese and Indian cultures. 

Researchers from the <a href="https://www.chicagobooth.edu/">University of Chicago Booth School of Business</a> found that sharing a plate helped promote collaboration and improve business negations. 

The results indicate that discussing a business deal over a family-style meal where people need to coordinate their actions and share food could prove to be a powerful negotiation tactic. 

The study was published in the journal Psychological Science, and the researchers were curious if the way a meal is served could influence cooperation. 

For the study, participants were split into pairs for a lab experiment, and each pair was given a negotiation scenario where one participant was a manager, and the other was a union representative with the goal of negotiating a better wage for the union. 

First, though, each pair of participants were either given a bowl of chips and a bowl of salsa to share or their own bowl of chips and salsa. 

While negotiating, the participants were given 22 rounds to agree on an acceptable wage. Each round represented one day, and by the third day, a union strike was scheduled to start. 

The strike was costly for both the manager and the representative so the quicker a negotiation could be reached the better. 

Pairs that had to share the chips and salsa took nine strike days to come to an agreement, four rounds less than pairs that did not have to share food. 

The researchers say that the act of sharing food had a driving influence on how people collaborated and negotiated. 

This was confirmed when the researchers repeated the experiment with pairs of both strangers and friends. No matter the relationship, pairs that shared food agreed on a wage quicker than those who didn’t have to share. 

The researchers say that meal and plate sharing could be beneficial for more than just negotiating business as it helped with collaboration and cooperation. 

“Basically, every meal that you're eating alone is a missed opportunity to connect to someone,” said Ayelet Fishbach, a co-author of the study. “And every meal that involves food sharing fully utilizes the opportunity to create that social bond.”

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Sharing a plate, not just a meal, improves collaboration and deals

There are many benefits to sharing a meal with others...

There are some fundamental <a href="https://www.earth.com/news/preserving-native-cultural-practice/">cultural practices</a> found in societies all over the world dating back to some of the earliest human settlements such as dancing and music, or magic and a belief in witchcraft. 

The fact that these universal cultural facets have been connected to the human experience for so long presents a puzzle for anthropologists who study the development and evolution of human cultures and societies. 

That’s according to Manvir Singh, a graduate student in <a href="https://heb.fas.harvard.edu/">Harvard University’s Department of Human Evolutionary Biology</a>, who recently published a paper delving into the oldest profession which he claims is shamanism. 

“Shamanism is only one of countless cultural practices that emerge nearly everywhere, yet exhibit very particular and odd features,” Singh told the Daily Mail. “These social and cultural universals — punitive justice, dance music, witchcraft, initiation ceremonies, and so on — are among the most fundamental puzzles of anthropology.” 

Singh suggests that witch doctors or shamans were the world’s first “specialists” because their abilities put them in a separate class of individuals which makes shamanism the oldest professional class. 

Sing detailed his findings and theories on shamanism in a paper published in the journal Behavioral and Brain Sciences.

“The theory is that there are important things we really want to have control over — calling rain, summoning animals, healing illness,” Singh told the <a href="https://www.dailymail.co.uk/sciencetech/article-6484341/Researchers-say-shamans-professional-class-human-society.html">Daily Mail</a>. “All around the world, people believe that these important, uncertain outcomes are influenced by invisible forces — gods, witches, their ancestors, fairies, and more. But a shaman says, ‘I can control that. I can talk to fairies. I can see signs of witches. I can be possessed by a god or speak to them.’”

Part of what separates shamans from say someone who makes tools or builds houses is that shamans need to undergo a transformation in order to provide the magical services required. 

“That creates two classes of individuals - those who have been transformed and those who have not,” Said Singh. “This creates a separate class of individuals where there is an entry requirement, and where they have near-exclusive jurisdiction over these services.”

Singh plans to continue his work exploring shamanisms and how the abilities of shamans give them power within their communities. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Is shamanism the world's oldest profession?

There are some fundamental cultural practices found in societies all...

The rate of infant and child mortality has <a href="https://www.earth.com/news/india-avoid-child-deaths/">decreased significantly all over the world</a> over the past 25 years.  

However, current mortality rates are nowhere near the targets put in place by the World Health Organization's <a href="https://www.who.int/news-room/fact-sheets/detail/millennium-development-goals-(mdgs)">Development Millenium Goals</a> which aimed to reduce instances of mortality in children under five by two-thirds by the year 2015. 

In developing and low-income countries, children face a three to thirteen percent increased risk of dying within the month following a discharge from the hospital. 

Researchers from the <a href="https://www.isglobal.org/en">Barcelona Institute of Global Health</a> and the <a href="http://manhica.org/wp/en/home-en/">Manhica Health Research Centers</a> conducted a study to better understand the risk factors involved in these increased mortality rates following hospital discharges.

The researchers developed an algorithm that could help identify the children who are at a higher risk of dying after hospitalization and who should receive follow up care. 

Having a system in place to identify which children are most at risk could help reduce instances of child mortality in low-income countries, according to the researchers. 

The study was published in the journal Pediatrics. 

For the study, the researchers reviewed and analyzed data from over 20,000 pediatric hospital admissions spanning nearly 20 years in a semi-rural area of Southern Mozambique to figure out child mortality risk during the months following a hospital discharge. 

“This is the largest study performed to date to evaluate mortality three months following hospital discharge in a rural area of a low-income country,” said Lola Madrid, the first author of the study.

The researchers found that there is a high risk of death following a hospital discharge for young children, and half of these deaths occur within a month of leaving the hospital. 

Infants under three months have the highest risk of all the age groups considered for the study. 
The researchers created a series of models using known risk factors like malnutrition or clinical pneumonia which could be used to identify the children that have the highest risk of mortality and thus would require proactive care. 

“If these simple models, based on easy-to-obtain parameters like those used in our study, are validated in other contexts, they could represent a valuable tool to save neonatal and infant lives in countries with a high burden of child mortality,” said Quique Bassat, the study coordinator.

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer 

Image Credit: Marta Solano

In low-income countries, children still face a high risk of death

The rate of infant and child mortality has decreased significantly...

A research team from <a href="https://www.jhsph.edu/">Johns Hopkins Bloomberg School of Public Health</a>, in collaboration with the <a href="https://www.nimh.nih.gov/labs-at-nimh/index.shtml">National Institute of Mental Health Intramural Research Program</a>, has found that an increase in one’s physical activity can help improve one’s <a href="http://www.earth.com/news/teenagers-moody-brain-changes/">mood</a>. These findings were published December 12th in the journal, <a href="https://jamanetwork.com/journals/jamapsychiatry">JAMA Psychiatry</a>.

The team gave a group of 242 study participants (150 women and 92 men), aged 15 to 84, and 54 of whom had bipolar disorder, activity trackers and electronic diaries. Over the course of two weeks, participants were asked to rate their happiness and energy on two separate number scales.

On average, the researchers noted that increased physical activity at one time during the day increased mood and energy at another point. And when a participant had more energy at one point, they would do more physical activity later on, keeping the positive, active cycle going. Increased activity also resulted in less sleep, and those who slept more often had less active days.

Not only did those who partook in more physical activity have better moods and perceived energy levels, but the researchers found that increased physical activity had an ever greater positive effect on those with bipolar disorder, a mental health diagnosis that affects about 3% of the U.S. adult population.

The head data analyst, Vadim Zipunnikov, PhD, an assistant professor in the <a href="https://www.jhsph.edu/departments/biostatistics/index.html">Bloomberg School's Department of Biostatistics</a>, hopes to apply these findings to future studies aimed at offsetting depressive and bipolar episodes.

"This study exemplifies the potential for combining the use of physical-activity trackers and electronic diaries to better understand the complex dynamic interrelationships among multiple systems in a real-time and real-life context," says Dr. Zipunnikov.

Dr. Zipunnikov and his team are currently investigating how physical activity and sleep are linked to pain, alcohol consumption, and stress.

--

By <a href="mailto:oliviagharvey24@gmail.com">Olivia Harvey</a>, <a href="http://earth.com">Earth.com</a> Staff Writer

Physical activity boosts mood, helps those battling bipolar disorder

A research team from Johns Hopkins Bloomberg School of Public...

Researchers may have solved the mystery of what part of the brain is on high alert when there is an itch that we just cannot seem to satisfy. The experts took a closer look at the negative feedback loop of an itch that is followed by scratching that makes the itch even worse.

An experiment with mice has revealed that the activity of a small subset of neurons, located in a deep <a href="http://www.earth.com/news/brains-suppress-obvious-creatively/">brain</a> region called the periaqueductal gray, is responsible for itch-evoked scratching behavior.

“Effective treatment for chronic itch is still lacking, which is largely due to our limited knowledge about the neural mechanism of itch,” explained study senior author Yan-Gang Sun of the <a href="http://english.cas.cn/">Chinese Academy of Sciences</a>. “Our study provides the starting point to further decipher how itch is processed and modulated in the brain. Eventually this might lead to the identification of new therapeutic targets.”


There are many different triggers that can cause itching, including allergic reactions, skin conditions, irritating chemicals, parasites, diseases, pregnancy, and cancer treatments. The dreadful itching and scratching cycle can have a negative impact on an individual's quality of life, and can also lead to serious skin and tissue damage. 

Despite the severity of these issues, relatively little is known about the brain regions involved in itch processing. The researchers suspected that the periaqueductal gray could be involved because of its role in processing sensory information such as pain.

[caption id="attachment_1863858" align="aligncenter" width="688"]<a href="https://www.earth.com/wp-content/uploads/2018/12/itch.jpg"><img class="wp-image-1863858 size-large" src="https://www.earth.com/wp-content/uploads/2018/12/itch-688x1024.jpg" alt="" width="688" height="1024" /></a> Illustration depicting how the brain amplifies the itch signal at the spinal level. Image Credit: Jing-Tao Miao[/caption]

For their investigation, the researchers started out by recording from periaqueductal gray neurons in freely moving mice that were induced to scratch through injections with either histamine or an antimalarial drug called chloroquine. 

Itch-induced scratching behavior could be tracked to the activity of a specific set of neurons that produce a neurotransmitter called glutamate and a neuropeptide called tachykinin 1 (Tac1). 

When the researchers knocked out the Tac1-expressing neurons, they found that itch-induced scratching substantially decreased. On the other hand, stimulation of these neurons triggered spontaneous scratching behavior, even without histamine or chloroquine.

“Itch sensation plays a key role in detecting harmful substances, especially those that have attached to the skin,” said Sun. “As itch leads to scratching behavior, this allows the animal to get rid of the harmful substances. In some cases, the lesion caused by scratching can evoke strong immune responses, which might help to combat the invaded substances.”

The study is published in the journal <a href="https://www.cell.com/neuron/home">Neuron</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Why does scratching often make us itch even more?

Researchers may have solved the mystery of what part of...

In 2009, the <a href="https://www.epa.gov/">Environmental Protection Agency</a> (EPA) issued a science-based finding that greenhouse gas emissions endanger public health and welfare, which expanded the agency's responsibility by creating a legal obligation to uphold the <a href="http://www.earth.com/news/epa-clean-air-act-weaken/">Clean Air Act</a>. And now, a new study has produced even stronger and more conclusive evidence that the 2009 Endangerment Finding was correct. 

The research could strengthen arguments against proposed changes to the Clean Air Act, such as the rollback of emissions standards. The new paper comes just three months after claims that President Trump plans to challenge the Endangerment Finding.

Study lead author Philip Duffy is the president of the <a href="https://whrc.org/">Woods Hole Research Center</a>.

“When the Endangerment Finding was issued, the evidence supporting it was extremely compelling,” said Duffy. “Now, that evidence is even stronger and more comprehensive. There's no scientific basis for questioning the endangerment finding.”

The current investigation was a collaboration among 16 experts from 15 different organizations. The team examined how the scientific evidence to support the 2009 finding has changed in the nine years since it was issued. The research was primarily focused on climate change impacts for public health, air quality, agriculture, forestry, water resources, sea level rise, energy, infrastructure, wildlife, ocean acidification, social instability, and the economy.


Study co-author Chris Field is the director of the <a href="https://woods.stanford.edu/">Stanford Woods Institute for the Environment</a>.  He explained, “There is no question that public health and welfare are endangered by climate change and we know that with much more confidence now than we did in 2009.”

The study expands upon the reach of the negative impacts from climate change that were listed in 2009 to include dangers from ocean acidification and threats to national security and economic well-being.

“Much of what we've learned since the original Endangerment Finding in 2009 arises from extreme events,” said study co-author Noah Diffenbaugh of Stanford University. “Our understanding of how global warming influences the odds of heat waves, droughts, heavy precipitation, storm surge flooding, and wildfires has increased dramatically in the last decade, as has our understanding of the related impacts, such as how hot conditions affect mental health, violence, and economic productivity.”

The research is published in the journal <a href="http://www.sciencemag.org/">Science</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 

Paid for by <a href="http://earth.com">Earth.com</a>

New study produces conclusive evidence backing Clean Air Act

In 2009, the Environmental Protection Agency (EPA) issued a science-based...

Scientists at the <a href="http://naturalhistory.si.edu/">Smithsonian National Museum of Natural History</a> are rewriting the history of <a href="http://www.earth.com/news/corn-industry-fertilizer-efficiency/">corn</a>, one of the world's most important crops. Based on genetic and archaeological evidence, the researchers have determined that a predecessor of today's corn plants was brought to South America from Mexico more than 6,500 years ago.

According to the new study, farmers in Mexico and the southwestern Amazon improved corn over thousands of years until it was fully domesticated in each region. The findings are providing scientists with new insight into the shared history of humans and corn plants. Study lead author Logan Kistler explained that this understanding is critical for managing our fragile relationships with the plants that feed us.

“It's the long-term evolutionary history of domesticated plants that makes them fit for the human environment today,” said Kistler. “Understanding that history gives us tools for assessing the future of corn as we continue to drastically reshape our global environment and increase our agricultural demands on land around the globe.”

Microscopic pollen and resilient plant remains found in ancient sediments indicate a history of fully domesticated maize use by around 6,500 years ago in the southwest Amazon and coastal Peru. Initially, the experts assumed the fully domesticated plant was carried there by people who were migrating south.

“As far as we could tell before conducting our study, it looked like there was a single domestication event in Mexico and that people then spread it further south after domestication had taken place,” said Kistler.

When geneticists sequenced the DNA of 5,000-year-old maize found in Mexico, however, it turned out that the story was not so simple. The genes were a mixture of those found in corn’s wild ancestor called teosinte and those of the domesticated plant.

“But you've got continuous cultivation of maize in the southwest Amazon from 6,500 years ago all the way up through European colonization,” said Kistler. “How can you have this flourishing, fully domesticated maize complex in the southwest Amazon, and meanwhile, near the domestication center in Mexico the domestication process is still ongoing?”

To investigate, the team reconstructed the plant's evolutionary history by conducting a genetic comparison of more than 100 varieties of modern maize that grow throughout the Americas, including 40 varieties that have just recently been sequenced. The genomes of 11 ancient corn plants were also included in the analysis. 

After mapping out the genetic relationships between the plants, several distinct lineages were identified, proving that the final stages of corn domestication happened more than once in more than one place.

“This work fundamentally changes our understanding of maize origins,” said study co-author Robin Allaby from the University of Warwick. “It shows that maize did not have a simple origin story, that it did not really form the crop as we know it until it left its homeland.”

The study is published in the journal <a href="http://www.sciencemag.org/">Science</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Fabio de Oliveira Freitas

Corn was domesticated more than once in different regions

Scientists at the Smithsonian National Museum of Natural History are...

New invasive tick could spread across the eastern US. An invasive insect known as the Asian longhorned tick, or Haemaphysalis longicornis, has been recently popping up in regions across North America. Since the first sighting was reported in New Jersey earlier this year, the <a href="http://www.earth.com/news/ticks-trapped-amber/">tick</a> has been found in eight other states and is expected to emerge in many more. 

Dr. Ilia Rochlin is an entomologist and researcher with the <a href="http://vectorbio.rutgers.edu/">Rutgers University Center for Vector Biology</a>. She studied climate data from where the tick is already established in East Asia, Australia, and New Zealand, and then combined climate data from North America to identify which habitats are suitable for the insect to flourish. 

The findings of the study suggest that the Asian longhorned tick could survive in a large region of eastern North America as well as in the coastal Pacific Northwest.

[caption id="attachment_1863845" align="aligncenter" width="700"]<a href="https://www.earth.com/wp-content/uploads/2018/12/map.png"><img class="wp-image-1863845" src="https://www.earth.com/wp-content/uploads/2018/12/map-1024x770.png" alt="" width="700" height="526" /></a> Image Credit: Ilia Rochlin, Ph.D., Rutgers University Center for Vector Biology[/caption]

“The Asian longhorned tick is a very adaptable species, especially in its native East Asia,” said Dr. Rochlin. “The optimal tick habitat appears to be defined by temperate conditions - moderate temperature, humidity, and precipitation. These climatic conditions also support forested or shrubby vegetation, providing prime environment for ticks. The eastern U.S. and China share similar landscape and climate.”

According to the <a href="https://www.cdc.gov/">Centers for Disease Control and Prevention</a> (CDC), H. longicornis is the first invasive tick to appear in the United States in about 80 years. Even though the tick has not yet been found to transmit disease-causing pathogens in North America, it has demonstrated this capability in Asia.

The tick is also known to have the unusual ability to reproduce by parthenogenesis, a process in which females produce offspring that are essentially clones. 

“At these initial stages of the Asian longhorned tick invasion, this coarse-scale modeling can alert public health and veterinary authorities in moderate - to high-risk regions,” said Dr. Rochlin. “Hopefully, this awareness will lead to increased surveillance and expanded public outreach and education, especially to the most exposed: farmers, hunters, outdoor workers, pet owners.”

The study is published in the <a href="https://academic.oup.com/jme">Journal of Medical Entomology</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 

Image Credit: Jim Occi, Rutgers University Center for Vector Biology

New invasive tick could spread across the eastern US

New invasive tick could spread across the eastern US. An...

Round skulls and brains are defining features of humans, but a new study has found that some individuals with specific <a href="http://www.earth.com/news/neanderthal-dna-protect-viruses/">Neanderthal</a> DNA fragments have heads that are slightly less rounded. The research is giving scientists new insight into the evolution of modern brain shape and function.

Study co-lead author Philipp Gunz, who is a paleoanthropologist at the <a href="https://www.eva.mpg.de/">Max Planck Institute for Evolutionary Anthropology</a>, explained: “We captured subtle variations in endocranial shape that likely reflect changes in the volume and connectivity of certain brain areas.”

According to co-lead author Amanda Tilot, the goal of the study was to identify “potential candidate genes and biological pathways that are related to brain globularity.”

The experts focused on the fact that living humans with European ancestry carry rare fragments of Neanderthal DNA in their genomes as a result of interbreeding between Neanderthals and the ancestors of modern Europeans.

[caption id="attachment_1863842" align="aligncenter" width="700"]<a href="https://www.earth.com/wp-content/uploads/2018/12/Modern-humans-with-Neanderthal-DNA.jpg"><img class="wp-image-1863842" src="https://www.earth.com/wp-content/uploads/2018/12/Modern-humans-with-Neanderthal-DNA-1024x478.jpg" alt="" width="700" height="327" /></a> Image Credit: Philipp Gunz (CC BY-NC-ND 4.0)[/caption]

The investigation was based on MRI brain scans and genetic information for about 4,500 people, including cranial shape and stretches of Neanderthal DNA. Ultimately, the researchers used the endocranial shape differences between Neanderthal fossils and modern human skulls to assess the shape of the participants’ brain images. 

The Neanderthal DNA fragments identified  in living humans contained two genes that have already been linked to brain development: UBR4 and PHLPP1.

“We know from other studies that completely disrupting UBR4 or PHLPP1 can have major consequences for brain development,” explained study senior author Simon Fisher. 

“Here we found that, in carriers of the relevant Neandertal fragment, UBR4 is slightly down-regulated in the putamen. For carriers of the Neandertal PHLPP1 fragment, gene expression is slightly higher in the cerebellum, which would be predicted to have a dampening effect on cerebellar myelination.”

The study authors emphasized that the effects of carrying these rare Neanderthal fragments are subtle.

“The Neanderthal variants lead to small changes in gene activity and only push people slightly towards a less globular brain shape,” said Fisher. “This is just our first glimpse of the molecular underpinnings of this phenotype, which is likely to involve many other genes.”

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 

Image Credit: Philipp Gunz (CC BY-NC-ND 4.0)

Modern humans with Neanderthal DNA have different head shapes

Round skulls and brains are defining features of humans, but...

On December 6, Malaysia set fire to close to three tons of seized pangolins scales, worth $9 million in the illicit wildlife market. This incineration makes an important statement to wildlife traffickers but some in the conservation field question the effectiveness of wildlife product burnings.

According to the wildlife trade monitoring group <a href="https://www.traffic.org/news/malaysia-incinerates-tonnes-of-seized-africa-sourced-pangolin-scales/">TRAFFIC</a>, the country of Malaysia burned 12% of their total scales from pangolin seizures in 2017. The three tons of pangolin scales came from three separate seizures by the Royal Malaysian Customs.

“Malaysia has emerged as a transit hub for the illicit trade of pangolins from Africa to Asia. Over a seven-month period between May and November 2017, Malaysia seized a whopping 17,131 kg of pangolin scales in 10 shipments originating from Africa,” the group states.

As Earth.com has previously<a href="https://www.earth.com/news/wildlife-trafficking-pangolins/"> reported</a>, pangolins are currently facing a global, and little known, crisis as a result of wildlife trafficking. The pangolin currently holds the title of the most trafficked mammal in the world with an estimated one million individuals taken from the wild in the last decade alone. All eight species of pangolins are currently listed on Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora affording them the highest international protection in the wildlife trade. Despite this protection, the illegal trade in pangolins has been rampant.

The species is in high demand in the wildlife market for its meat, skin and scales. Pangolin skins have been used to make boots, shoes and leather and the scales are commonly used for traditional medicine. The recent burning of pangolin scales ensures these products never enter the wildlife market and symbolizes the country’s commitment to protecting the species.

The burning of wildlife products has become a common practice for countries across the world. Countries accumulate wildlife products as they continue to thwart trafficking efforts. Instead of simply holding onto the illicit products, countries have gotten creative in efforts to deter wildlife traffickers.

In 2016, Kenya burned 105 tons of ivory in the largest ever ivory stockpile burn. This burn took out ten percent of the global stock of elephant ivory. The United States burned six tons of elephant ivory in 2013 and two tons in 2017. Between 1989 and April 2016,<a href="https://cites.org/sites/default/files/eng/cop/17/WorkingDocs/E-CoP17-57-03.pdf"> over 100 tons</a> of ivory was destroyed, with the practice gaining momentum in the later years.

Supporters of wildlife product burnings argue that the burnings send the message that wildlife products have no value and that governments will not tolerate wildlife trafficking.

Kenyan president Uhuru Kenyatta<a href="https://www.theguardian.com/environment/2016/apr/30/kenya-to-burn-largest-ever-ivory-stockpile-to-highlight-elephants-fate"> stated</a> during the ivory burning ceremony, “Kenya is making a statement that for us ivory is worthless unless it is on our elephants. This will send an absolutely clear message that the trade in ivory must come to an end and our elephants must be protected. I trust that the world will join us to end the horrible suffering of our herds and save our elephants for future generations.”

Critics of the practice worry that destroying large amounts of wildlife products will only make the remaining wildlife products more valuable. Botswana, South Africa, Namibia and Zimbabwe have even proposed that their stockpiles of seized wildlife products should be sold and the proceeds be used for wildlife conservation.

Botswana, Namibia and Zimbabwe were allowed to sell part of their ivory stockpiles in a one-off sale to Japan in 1999 and to China and Japan in 2008, with South Africa also participating in this one-off sale. These one-off sales could have enabled wildlife traffickers to launder their illegal products, as it is can be impossible to distinguish between legal ivory bought in a one-off event and poached ivory products. Botswana, home to the largest population of wild elephants, has since changed their viewpoint on the issue and<a href="https://medium.com/@CountingElephants/end-african-elephant-poaching-by-banning-the-ivory-trade-918b81f40c21"> support</a> ending the international trade in elephant ivory permanently.

A 2016<a href="https://www.nber.org/papers/w22314.pdf"> study</a> published by the National Bureau of Economic Research found a 66% increase in illegal ivory production across two continents and 71% increase in ivory smugglings out of Africa after the 2008 one-off ivory stockpile sale. While the price of ivory fell after the one-off sale, the researchers believe that the sale helped to de-stigmatize ivory causing increased demand for the product.

Some countries want to go beyond one-off sales by lifting the ban on the international trade of ivory products. By holding on to stockpiles of illicit wildlife products, these countries could make huge profits if the ivory trade was re-opened. The countries who choose to burn their stockpiles make it clear that they are not holding out hope for a legalized international ivory trade.

While wildlife product burnings are likely to remain a contentious issue in the conservation field, it is clear that the seizure of three tons of pangolins scales is a major conservation win for the much imperiled species.

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By <a href="mailto:brianna.grant134@gmail.com">Brianna Lynne</a>, <a href="http://earth.com">Earth.com</a> Contributing Writer

Malaysia burns 3 tons of seized pangolin scales to deter trafficking

On December 6, Malaysia set fire to close to three...

An international team of scientists analyzed the spread of Alzheimer's disease and other <a href="http://www.earth.com/news/elderly-gun-owners-dementia/">dementia</a> between 1990 and 2016 across more than 195 countries. The study revealed that the number of people living with dementia more than doubled during this time frame, which is primarily due to the rate of growth and aging among the global population.

Overall, the researchers found that there were 43·8 million people living with dementia in 2016, including 27 million women and 16.8 million men. This represents a 117 percent increase from 20.2 million dementia patients in 1990.

Over the same 26-year study period, the number of deaths from dementia increased by 148 percent. Dementia is now the fifth most common cause of death worldwide and the second most common among people aged 70 and older.

“By 2050, the number of people living with dementia could be around 100 million,” wrote the researchers. “Tackling this will require training of health professionals, as well as planning and building facilities to cater to increasing numbers individuals with dementia.” 

The cost of care for dementia patients is very high, particularly in high-income countries. In the United States, this cost was $818 million in 2015 alone, which was a 35 percent increase from five years earlier. 

“Since aging is expected to continue, the only way to reduce burden and associated costs is to identify effective preventive or treatment measures,” wrote the study authors.  

“Despite the low return on research investment in dementia in the past, the size of the burden and its increasing trend warrant a continued effort to find effective means of intervening. Until such breakthroughs are made, dementia will constitute an increasing challenge to health-care systems across the globe.”

The research is published in the journal <a href="https://www.thelancet.com/neurology">The Lancet Neurology</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

The number of dementia patients has more than doubled in 26 years

An international team of scientists analyzed the spread of Alzheimer's...

A team of researchers at the Department of Energy's <a href="https://www.lbl.gov/">Berkeley Lab</a> has investigated how the amount of fresh water that originates in the Sierra Nevada mountain snowpack will be affected by future <a href="http://www.earth.com/news/global-warming-industrial-revolution/">global warming</a>. After analyzing the headwater regions of California's 10 major reservoirs, the experts are predicting a 79 percent drop in peak snowpack water volume by the end of this century.


The researchers also found that the timing of the peak snow melt could advance by four weeks, creating a delay between the time water is available and when it is needed the most. The investigation, which was focused on when and how snow melt would change, was based on climate simulations at the middle and the end of the century across five different climate models.

Alan Rhoades is a Berkeley Lab postdoctoral fellow and the study's lead author.

“This study is unique in that we're sampling across a community of models so we can see if models disagree at mid-century and end of century across a number of different snowpack measures, such as peak timing, total water volume, and melt rate,” said Rhoades. “What we found is the models usually disagree more at mid-century, but by end century they are pretty much in unison with another that under a high-emissions scenario there will be a dramatic decline in Sierra Nevada snowpack by 2100.”

Snowpack melt is a critical source of  water in California. Mountain snowpack provides the state with about two-thirds of its fresh water supply, much of which comes in a very narrow window. 

“Our precipitation is really intermittent and extremes-driven,” said Rhoades. “We basically get 50 percent of our annual precipitation in five to 15 days, or one to two weeks. Our water demand is highest during the summer months when we don't get a lot of precipitation, so we really rely on mountain snowpack as a stopgap for our water supply.”

The amount of snowfall is projected to decrease while rain could increase, which will contribute even more to the issue. Rhoades explained, “So as the world continues to warm, these storms will get even warmer and won't readily get to freezing, whereby you could have snowfall or snow accumulation and the persistence of snow on the surface.”

The study is published in the journal <a href="https://onlinelibrary.wiley.com/journal/19448007">Geophysical Research Letters</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 

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Global warming could drastically impact California water supply

A team of researchers at the Department of Energy's Berkeley...

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



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



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



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

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



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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

Flu viruses are more flexible than expected

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

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



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



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



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



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

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



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



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



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.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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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&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> Staff Writer 



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.

Lesotho: Africa's "Kingdom in the Sky"

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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://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

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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"

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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...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> is focused on the melt ponds that emerge during the spring and summer on the Greenland Ice Sheet, which is the largest ice mass in the northern hemisphere.



"Melt ponds are vast pools of open water that form on both sea ice and ice sheets and are visible as turquoise-blue pools of water in this Copernicus Sentinel-2 image," says ESA.



"When snow and ice melts atop glaciers, water flows in channels and streams and collects in depressions on the surface. These melt ponds can speed up the melting of the surrounding ice since they greatly reduce the ice’s ability to reflect sunlight."



"This can create a positive feedback where an increasing number of melt ponds absorb more heat which causes ice cover to melt even faster."



According to ESA, Greenland has been hit with a late-season heatwave that began in early September. This caused the type of melt event that usually occurs in the middle of summer.



"In a recent paper published in Nature Climate Change, scientists found that major sea-level rise from the melting of the Greenland ice cap is now ‘inevitable’ even if the burning of fossil fuels were to halt overnight," says ESA. "Using satellite observations of Greenland ice loss and ice cap from 2000 to 2019, the team found the losses will lead to a minimum rise of 27 cm regardless of climate change."



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.

Melt ponds on the Greenland Ice Sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes a new map of Mars that is providing insight into the planet’s watery past. The map also reveals where future missions could safely land on Mars.&nbsp;



The map has been created over the last decade using observations of water-rich rocks and mineral deposits. The images were captured by ESA’s Mars Express and NASA’s Mars Reconnaissance Orbiter.



"A big surprise is the prevalence of these minerals, with the map revealing hundreds of thousands of water-affected locations in the oldest parts of the planet," says ESA. "The new data will help answer exciting questions about Mars’ climate history, whether water was globally persistent or confined to short, intense episodes, and whether the conditions were ever suitable for life."



"Specifically, the map shows the locations and abundances of aqueous minerals. These are from rocks that have been chemically altered by the action of water in the past, and have typically been transformed into clays and salts."



According to John Carter of the Institut d’Astrophysique Spatiale (IAS), our collective understanding of Mars has been oversimplified. He explained that planetary scientists have tended to think that only a few types of clay minerals on Mars were created during its wet period, then as the water gradually dried up, salts were produced across the planet.



The new map shows that the composition of Mars is much more complicated than what we thought. For example, while many salts formed after Martian clays, there are some salts that are presumed to be older than some of the clays.&nbsp;



“The evolution from lots of water to no water is not as clear cut as we thought, the water didn’t just stop overnight. We see a huge diversity of geological contexts, so that no one process or simple timeline can explain the evolution of the mineralogy of Mars. That’s the first result of our study. The second is that if you exclude life processes on Earth, Mars exhibits a diversity of mineralogy in geological settings just as Earth does,” said Carter.



Video 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 history of Mars is much more complex than we thought

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Today's Video of the Day from the <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes how cavefish adapted to a sedentary lifestyle over tens of thousands of years. 



The experts found that the muscle metabolism of cavefish has been genetically reprogrammed over time. As a result, the animals have experienced major changes in their morphology and behavior. Despite these changes, however, the cavefish remain healthy and fit.



The research may provide new clues about the evolutionary consequences of prolonged physical inactivity in humans.&nbsp;



“It’s no surprise that people are moving less and less as technology has advanced,” said Rohner. “With cavefish, we have a unique system where we can study what might happen if people remained couch potatoes over very, very long periods of time.”



Video Credit: Stowers Institute for Medical Research



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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.

Cavefish are healthy despite their sedentary lifestyle

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> some of the most incredible waves in the world, as seen by Landsat satellites.



"With more than 370,000 miles of coastline on Earth, there are plenty of places where epic waves build up, curl over, and hurtle toward the shore.- much to the thrill of surfers," says NASA. "There are some places where these waves are so magnificent that they can be seen from space."



"With the broad perspective of satellites, we can see how these iconic waves develop into the world’s tallest, longest, fastest, and heaviest."



Video Credit: NASA Earth Observatory&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 capture the world's biggest and fastest waves

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes why satellite images and measurements of our planet have become "essential to our survival, offering a new outlook of our world."&nbsp;



Rising sea levels pose one of the biggest societal threats associated with climate change. According to ESA, satellite altimeter missions such as Copernicus Sentinel-6 are essential in monitoring global and regional changes in sea level.



"Unbeknown to many, the island of Crete, Greece, plays an important role in the Copernicus satellite altimetry constellation and on an international stage," reports ESA.



"Satellite altimetry data have to be continuously monitored at the ESA’s Permanent Facility for Altimetry Calibration where different techniques have pioneered the use of transponders to provide the best measurements to validate satellite altimeters in space soon after launch."



Dr. Craig Donlon explains that, by understanding planet Earth through satellite measurements, we are able to find evidence of change.&nbsp;



Video Credit: European Space Agency&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

Satellites have become essential to our survival

[sendtonews key="761m2QQvR1-2035772-12187" type="single"] Today’s Video of the Day from the...