A human-monkey embryo has been created using stem cells. (Ivan D. Gromicho)
A human-monkey embryo has been created using stem cells. (Ivan D. Gromicho) Chinese researchers have successfully created chimeric embryos by combining human stem cells and monkey blastocysts, a groundbreaking advance with both practical and ethical implications for the future of medicine.

Brain temperature can be an important health indicator, but measuring it has been tricky until now. (AP Photo/Erika Kinetz)
Brain temperature can be an important health indicator, but measuring it has been tricky until now. (AP Photo/Erika Kinetz)Brain temperature differs from body temperature and is an important indicator of health after an injury, but it's difficult to measure without invasive procedures such as the implantation of temperature probes. A group of researchers has proposed a new biophysical model that can predict personalized brain temperature using data from magnetic resonance imaging (MRI) of individual brain tissue and vessel structures.

The pandemic had opposite effects on rental prices between white neighborhoods and more diverse ones. (AP Photo/David Zalubowski)
The pandemic had opposite effects on rental prices between white neighborhoods and more diverse ones. (AP Photo/David Zalubowski)The first four months of the COVID-19 pandemic saw large decreases in the mean and median rent prices in the largest metropolitan cities in the United States, but those decreases were driven almost entirely by price reductions in Black, Latino and diverse neighborhoods, according to new research on how the pandemic impacted rental markets.

A shockingly small percentage of the planet is "ecologically intact." (AP Photo/Matthew Brown)
A shockingly small percentage of the planet is "ecologically intact." (AP Photo/Matthew Brown)A new study argues that just 2.8% of Earth's terrestrial area is "ecologically intact," about 10 times lower than previous estimates, which scientists use to help prioritize areas for conservation.

Physicists have concluded that some masses of boson particles don't actually exist. (Unsplash/John Paul Summers)
Physicists have concluded that some masses of boson particles don't actually exist. (Unsplash/John Paul Summers)Physicists have concluded that some masses of boson particles — members of the things-that-could-explain-dark-matter club — don't actually exist, meaning the parameters for locating the presumably vast but hypothetical material just became more refined.

Counties that leaned Republican were less likely to show strict adherence to social distancing recommendations. (AP Photo/Eric Gay)
Counties that leaned Republican were less likely to show strict adherence to social distancing recommendations. (AP Photo/Eric Gay)U.S. counties with lower per capita income and greater Republican orientation were associated with significantly reduced physical distancing during the COVID-19 pandemic, according to a new study that shows how government policies failed to close disparities between communities throughout almost the entirety of the pandemic.

Major medical organizations may have little or nothing in the way of policies to prevent conflicts of interest. (AP Photo/Felipe Dana)
Major medical organizations may have little or nothing in the way of policies to prevent conflicts of interest. (AP Photo/Felipe Dana)The medical organizations that produce widely followed guidelines for the diagnosis and treatment of health conditions have largely failed to create adequate policies addressing conflicts of interest in how those guidelines are produced, an analysis found, creating a risk for biased medical advice.

A popular method for determining water pollution may be wildly inaccurate. (AP Photo/Gerry Broome)
A popular method for determining water pollution may be wildly inaccurate. (AP Photo/Gerry Broome)A technique used worldwide to determine organic carbon pollution in natural waters has been revealed to overestimate concentration levels by up to 90%, meaning some environmental policies may be based on considerably incorrect data.

3D-printed skin may soon be an option for diabetic skin issues. (Pixabay/Beeki)
3D-printed skin may soon be an option for diabetic skin issues. (Pixabay/Beeki)Scientists have used 3D cell printing to create a model of skin that mimics the skin ailments associated with diabetes, allowing researchers to study symptoms and therapeutics related to these conditions without relying on animal models.

Processing speeds might someday shoot through the roof, thanks to "polar vortices." (AP Photo/Khalil Senosi)
Processing speeds might someday shoot through the roof, thanks to "polar vortices." (AP Photo/Khalil Senosi)Physicists and material scientists have created a way to interact with electricity-based "polar vortices" that respond to signals at a rate of nearly 400 billion times per second, a fundamental scientific approach that could someday provide data storage and processing that is more compact and more than 100 times faster than some modern central processing units.

One species of oyster seems to be shrugging off ocean acidification. (AP Photo/Phil Sears)
One species of oyster seems to be shrugging off ocean acidification. (AP Photo/Phil Sears)Ocean acidification is a threat to shell-making organisms across the seas, but one species of oyster may provide a unique exception to this rule.

Nanosensor incorporating gold and sugar could protect against E. coli infections. (CDC/Janice Carr)
Nanosensor incorporating gold and sugar could protect against E. coli infections. (CDC/Janice Carr)A reusable sensor built with tiny gold particles and a common sugar can identify a wide range of concentrations of the bacterium Escherichia coli at low cost, which could potentially protect millions of people from bacteria in food or sewage water.

Neurons produced from stem cells are analyzed for G4 structures, which are disruptive configurations of DNA sequences. They are much more prevalent in Alzheimer's disease neurons, according to new research. (University of Montreal/Bernier lab)
Neurons produced from stem cells are analyzed for G4 structures, which are disruptive configurations of DNA sequences. They are much more prevalent in Alzheimer's disease neurons, according to new research. (University of Montreal/Bernier lab)Canadian biologists showed that neurons afflicted with Alzheimer's disease develop disruptive G-quadruplex structures in their DNA — and the researchers found a gene that prevents that.

Closing schools in the California Bay Area greatly limited the spread of COVID-19. (AP Photo/Jeff Chiu)
Closing schools in the California Bay Area greatly limited the spread of COVID-19. (AP Photo/Jeff Chiu)School closures early in the COVID-19 pandemic cut the projected number of coronavirus infections in the San Francisco Bay Area in half, but schools can reopen safely if they follow a series of safety precautions, according to computer modeling work by University of California, Berkeley researchers.

The effects of school shootings on survivors can last a lifetime. (AP Photo/Christian Monterrosa)
The effects of school shootings on survivors can last a lifetime. (AP Photo/Christian Monterrosa)Researchers find substantial evidence that, relative to their unexposed peers, school shooting survivors in the U.S. experience declines in health and well-being, engage in more risky behaviors and have worse education and labor market outcomes.

We're better at identifying happy screams than those of anger or terror. (Pixabay/StartupStockPhotos)
We're better at identifying happy screams than those of anger or terror. (Pixabay/StartupStockPhotos)Scientists at the University of Zurich have discovered that humans can more efficiently process and categorize screams that evoke positive or nonalarming emotions than those that communicate aggression or fear.

Work stress can affect minds and bodies. (Unsplash/Tim Gouw)
Work stress can affect minds and bodies. (Unsplash/Tim Gouw)Employees dealing with work-induced stress can experience changes to their physiology, according to organizational behavior researchers, which may result in their personality traits fluctuating or even fundamentally changing over time.

Proximity to Superfund sites affects life expectancy of millions of Americans. (AP Photo/Matthew Brown)
Proximity to Superfund sites affects life expectancy of millions of Americans. (AP Photo/Matthew Brown)A hazardous waste site shaves up to 1.22 years off a neighboring community's life expectancy, a new study shows, with the worst effects occurring in poorer neighborhoods with more people of color.

There's new relief for those who get a little queasy from VR adventures. (AP Photo/Martin Meissner)
There's new relief for those who get a little queasy from VR adventures. (AP Photo/Martin Meissner)Researchers have developed a vibrating platform that can reduce the effects of cybersickness for some virtual reality users, addressing an increasingly urgent problem as VR becomes more prevalent in education, art, entertainment and communications.

Even nonlethal doses of agricultural chemicals can have big effects on bees. (Luis Claudi Silveira and Khalid Haddi)
Even nonlethal doses of agricultural chemicals can have big effects on bees. (Luis Claudi Silveira and Khalid Haddi)Researchers have found that even at doses too low to kill, agricultural chemicals impact the color preference, respiration and locomotion of native stingless bees in South and Central America.

Harmless-looking white dwarf stars might be carrying an explosive surprise. (NASA/JPL-Caltech/University of Wisconsin via AP)
Harmless-looking white dwarf stars might be carrying an explosive surprise. (NASA/JPL-Caltech/University of Wisconsin via AP)Physicists may have discovered the first naturally occurring "bombs" lying dormant within white dwarf stars roaming outer space, and if detonated, the explosive material could force an entire star's destruction.