Even a moderate increase in altitude can have some severe effects on the human mind and body. (AP Photo/Niranjan Shrestha)
Even a moderate increase in altitude can have some severe effects on the human mind and body. (AP Photo/Niranjan Shrestha) Living at even moderately high altitudes could be a risk factor for depression and suicide because it leads to chronic inflammation, according to researchers who ran experiments on rats at sea level in California and at one mile high in Colorado.

Childhood diarrhea kills thousands, and now the factors contributing to it are becoming clearer. (AP Photo/Tsvangirayi Mukwazhi)
Childhood diarrhea kills thousands, and now the factors contributing to it are becoming clearer. (AP Photo/Tsvangirayi Mukwazhi) In one of the widest-reaching studies on childhood diarrhea, researchers have uncovered trends in a range of individual-, community- and country-level factors that contribute to the disease, including a nearly threefold increase in prevalence for developing countries.

There's a new way to make sure surgeons don't leave anything behind when they're done. (AP Photo/Molly Riley)
There's a new way to make sure surgeons don't leave anything behind when they're done. (AP Photo/Molly Riley) A novel X-ray image database could assist radiologists in identifying medical equipment left inside patients' bodies after surgery, addressing a recurring problem involving items ranging from soft sponges and surgical masks to blades, needles and retractors.

Students'  use of e-cigarettes to smoke pot varied among racial and ethnic groups. (AP Photo/Frank Franklin II)
Students'  use of e-cigarettes to smoke pot varied among racial and ethnic groups. (AP Photo/Frank Franklin II) A new study conducted by the U.S. Centers for Disease Control and Prevention indicates that use of marijuana in e-cigarettes at least once varies by racial group among U.S. youth, highlighting the importance of equitable implementation of health education and targeted intervention strategies against vaping as it becomes increasingly common.

Can you crochet skin? (Pixabay/Montavius Howard)
Can you crochet skin? (Pixabay/Montavius Howard) Researchers at the Georgia Institute of Technology have designed a new scaffold for tissue engineering by crocheting yarns into a fabric, a method that shows the potential to imitate properties of human skin — or even organs — that are difficult to replicate in a laboratory.

The part of our brain that helps us figure out where we are also helps with navigating social situations. (Unsplash/Christina @ wocintechchat.com)
The part of our brain that helps us figure out where we are also helps with navigating social situations. (Unsplash/Christina @ wocintechchat.com) Researchers from the University of California, Los Angeles, have discovered that the brain regions involved in processing spatial information are also involved in inferring social relationships and hierarchies, as they navigate attention shifts in both social knowledge situations and external spatial knowledge.

We're learning more about what sets us apart from our primate cousins. (Pexels/Andre Mouton)
We're learning more about what sets us apart from our primate cousins. (Pexels/Andre Mouton) Scientists have shed new light on why our brains developed differently from those of other primates and given rise to human culture, language and tool use, discovering that the cerebellum may have played a greater role in the evolution of the human brain than previously thought.

Setting up lunch dates aren't the best use for text messages anymore. (Pexels/Tim Samuel)
Setting up lunch dates aren't the best use for text messages anymore. (Pexels/Tim Samuel) Researchers with the University of Pennsylvania's Behavior Change for Good Initiative sent "text-based nudges" to patients with primary care doctor's appointments reminding them to get a flu shot, leading to increased vaccination rates and lending support to a similar texting system for similar interventions, including COVID-19 vaccines.

A blood test for cancer DNA? The new test might revolutionize cancer detection. (AP Photo/Jerome Delay)
A blood test for cancer DNA? The new test might revolutionize cancer detection. (AP Photo/Jerome Delay) An experimental test successfully detected cancerous mutations in tumor cells by analyzing their DNA that is free-floating in blood, employing a strip test that displays results within 10 minutes.

A simple blood test might help figure out baby's arrival date. (Pexels/Amina Filkins)
A simple blood test might help figure out baby's arrival date. (Pexels/Amina Filkins) Biomarkers in expectant women’s blood change throughout pregnancy, according to a new study that lays the groundwork for a test that could pinpoint the date of a baby’s arrival.

Access to contraception gives girls and young women a better shot at a good start in life. (Pexels/Emily Ranquist)
Access to contraception gives girls and young women a better shot at a good start in life. (Pexels/Emily Ranquist) Teen girls and young women in Colorado graduated high school at higher rates after the state expanded access to affordable contraception — some of the strongest quantitative evidence of better reproductive choices shaping the life trajectories of women.

The bonobo Muhdeblu, pictured here with her newly born offspring in 2014, had her DNA sequenced in a recent genome study. (Claudia Philipp/Wuppertal Zoo)
The bonobo Muhdeblu, pictured here with her newly born offspring in 2014, had her DNA sequenced in a recent genome study. (Claudia Philipp/Wuppertal Zoo) A large collaboration of scientists has sequenced and identified more than 98% of the genes in a bonobo, one of humans' closest evolutionary cousins, revealing surprising speed and complexity in the evolution of genes within the great-ape family and marking a significant improvement from earlier sequencing.

A long-standing mathematical limit on the size of social circles is being challenged. (Pexels/Jeffrey Czum)
A long-standing mathematical limit on the size of social circles is being challenged. (Pexels/Jeffrey Czum) A team of Swedish researchers has found no basis for the existence of Dunbar's number, a hypothesized average of the number of individuals who can practically fit within a functioning social circle, often cited as 150 people.

A malleable dental membrane promises to make many treatments easier. (Pexels/Andrea Piacquadio)
A malleable dental membrane promises to make many treatments easier. (Pexels/Andrea Piacquadio) Researchers are seeking a patent for an implant known as a dental membrane that is designed to be both flexible and sturdy, combining the advantages of two traditional kinds of membranes used in people with gum disease.

Even low levels of air pollution can affect how older mens' brains work. (AP Photo/Eric Risberg)
Even low levels of air pollution can affect how older mens' brains work. (AP Photo/Eric Risberg) Air pollution could impact the cognitive function of older men more than previously thought — even from short-term exposure and at concentrations below World Health Organization guidelines for what's considered safe to breathe, a new study suggests.

Poor diet connected to trauma and PTSD in military vets. (Unsplash/Hamza Nouasria)
Poor diet connected to trauma and PTSD in military vets. (Unsplash/Hamza Nouasria) New research suggests that military veterans living with trauma and post-traumatic stress disorder who suppress their emotions may spark a pattern of unhealthy eating, indicating that close attention to diet quality could potentially provide a framework for more effective therapies.

An osteoporosis treatment is showing promising results in mice. (AP Photo/Robert F. Bukaty)
An osteoporosis treatment is showing promising results in mice. (AP Photo/Robert F. Bukaty) Researchers have developed an osteoporosis treatment that halted bone loss and promoted bone growth in a mouse model of the disease.

Intermittent fasting's benefits go far beyond any weight loss. (AP Photo/J.M. Hirsch)
Intermittent fasting's benefits go far beyond any weight loss. (AP Photo/J.M. Hirsch) The health benefits of intermittent fasting could be partly due to changes in certain gut bacteria, according to researchers who looked at people who fasted for the Islamic holy month.

If this picture makes you itchy, a new sensor can track when you scratch. (Pixabay/WikiImages)
If this picture makes you itchy, a new sensor can track when you scratch. (Pixabay/WikiImages) Scientists have devised a more objective way of measuring itch with a wearable sensing technology that tracks how often people scratch themselves and accurately distinguishes real scratching from similar motions, potentially giving physicians better information to help patients with eczema and other itch-related conditions find relief.

Genetic ancestry is important in assessing disease risk, but it's important to steer clear of racism. (Unsplash/Laura Furhman)
Genetic ancestry is important in assessing disease risk, but it's important to steer clear of racism. (Unsplash/Laura Furhman) Considering race and ethnic background when assessing disease burden is believed to walk a fine line between informed care and systemic racism, but arguing that heritage can weigh heavily on one's propensity for illness, researchers are advocating for a refined way of incorporating genetic ancestry without teetering toward the side of prejudice.

The way Ebola responds to human RNA may lead to a way to defeat it. (CDC via AP/Frederick Murphy)
The way Ebola responds to human RNA may lead to a way to defeat it. (CDC via AP/Frederick Murphy) A key protein produced by the Ebola virus transforms into different shapes depending on whether human genetic material is nearby, suggesting a potential target for drugs to fight the deadly pathogen.