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NPR's Audie Cornish talks with Dr. George Daley, the dean of Harvard Medical School, about the ethical discussions surrounding editing the DNA of human embryos and what the future of the technology might look like.

President Trump announced Thursday that his administration plans to declare a national emergency to deal with the opioid epidemic. Six states have already taken this step.

Grace Mugabe, wife of longtime leader Robert Mugabe, allegedly assaulted a model who says she was at the same hotel as Mugabe's sons. But so far, Mugabe has not surrendered to South African police.

It's March Mammal Madness, a bracket with real animals facing off in fictional battles. Hundreds of science classes are playing in schools around the country.

NASA's Cassini's spacecraft will begin the final stages of its 20-year mission to Saturn before diving into the planet and ending its lengthy stretch orbiting the planet.

Applicants have to go through "extreme vetting" including a grueling polygraph exam. In the past, Customs and Border Protection has had trouble retaining agents.

A businessman will charter some 60 Qatar Airlines flights for the bovines. He aims to jump-start a dairy industry in Qatar, which risks food shortages while its border is closed.

A few decades ago, babies born with conditions such as congenital heart disease or cystic fibrosis often didn't survive past childhood. Now many live longer, but adult medicine has not kept pace.

Photos of an owl swooping in with wings wide, eyes glowing and talons outstretched might not really be because of chance. Photographers using mice to lure the owls have caused a fierce debate.

Wins by Katie Ledecky and Michael Phelps have helped American swimmers dominate the competition in what is proving to be an exceptional Olympic showing.