Last year, Eliud Kipchoge became the first athlete to run a marathon in less than two hours. He was wearing a type of shoe that reportedly will not be allowed in elite competition in the future. Jed Leicester/AP hide caption
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Friday
Until the 19th century, scientists did not understand the role of hand-washing in disease prevention. Thomas Lohnes/DDP/AFP via Getty Images hide caption
Thursday
The auroral dunes appear as green waves in the sky. Kari Saari/University of Helsinki hide caption
Wednesday
Making sure to frequently give your hands a thorough scrub — with soap and for about as long as it takes to sing the "Happy Birthday" song a couple of times — can significantly cut your chances of catching the flu or other respiratory virus. Mandel Ngan/AFP via Getty Images hide caption
Worried About Catching The New Coronavirus? In The U.S., Flu Is A Bigger Threat
Scientists say pea-size organoids of human brain tissue may offer a way to study the biological beginnings of a wide range of brain conditions, including autism, bipolar disorder and schizophrenia. Muotri Lab/UCSD hide caption
Scientists Find Imperfections In 'Minibrains' That Raise Questions For Research
A surgical mask and an N95 respirator. Officials in China are urging citizens to wear masks in public to stop the spread of the coronavirus. But can a mask really keep you from catching the virus? Science Photo Library/ Getty Images; South China Morning Post/Getty Images hide caption
Monday
Sunday
Local health workers across the U.S. have been reaching out to the Centers for Disease Control and Prevention for guidance on how to screen, manage and treat potential cases of coronavirus. Currently, testing for the virus must take place at the CDC. Kevin C. Cox/Getty Images hide caption
Saturday
This photo provided by NASA shows the view from NASA's Andrew Morgan's helmet cam as Italian astronaut Luca Parmitano works outside the International Space Station during a spacewalk Saturday. AP hide caption
Friday
Roughly 1 in 10 infants were born prematurely in the U.S. in 2018, according to the Centers for Disease Control and Prevention. The drug Makena is widely prescribed to women at high risk of going into labor early, though the latest research suggests the medicine doesn't work. Luis Davilla/Getty Images hide caption
A health officer screens arriving passengers from China at Changi International airport in Singapore on January 22, 2020 as authorities increased measures against coronavirus. Roslan Rahman/AFP via Getty Images hide caption
Thursday
The Doomsday Clock reads 100 seconds to midnight, a decision made by the Bulletin of the Atomic Scientists that was announced Thursday. The clock is intended to represent the danger of global catastrophe. Eva Hambach/AFP via Getty Images hide caption
Why are some warnings heard, while others are ignored? Angela Hsieh hide caption
Wednesday
This chicken from Memphis Meats was produced with cells taken from an animal and grown into meat in a "cultivator." The process is analogous to how yeast is grown in breweries to produce beer. Allison Aubrey/NPR hide caption