The National Academies of Sciences, Engineering and Medicine sorted through 10,000 studies to determine the good and bad health effects of marijuana. Tight drug restrictions impede research, they say.

A new NPR/Ipsos poll shows many Americans don't know details about the Affordable Care Act. And only 1 in 7 favors repealing the law altogether without a replacement.

A statewide collaborative of nail salons now has 120 members; all have made ventilation upgrades and switched from toxic products to safer ones. Will clients be willing to pay extra to help workers?

Pew surveyed nearly 8,000 officers. Among other things, the group asked about recent killings of black civilians by police and the protests that followed. Officers said they now feel less safe.

OK, so they're not using Fitbits. But zoos across America are using software to minutely track the activity, behavior and physiology of captive elephants, and using that data to improve zoo life.

President Obama follows a tradition dating back to George Washington. Over the years, presidents have offered warnings about partisanship, praised balance of power and shared regrets.

Most people's doctors put their health information in an electronic health record. Scientists are mining those records for clues to what treatments work best for individuals.

From birth through age 30 or so, our ability to recognize faces keeps improving, research shows. At first, kids discern adult faces better than other kids' mugs. Not so after adolescence.

Donald Trump has suggested he may give his daughter and son-in-law a role in his administration. A law bars presidents from hiring family, but a court ruled it doesn't apply to White House staff jobs.

A promised crackdown on people living in this country illegally could mean a boon for private prison companies that contract with the government to hold detainees.