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Even at low doses, the potent poison damages organs and causes cancers. Now scientists have found a population high in the Andes Mountains that has adapted to the toxic metal over thousands of years.

Foods from Fukushima, Japan, are back to pre-accident levels of radiation but people still aren't eating them. One way to ease concerns: a chemical that blocks radioactive cesium from entering plants.

The Nigerian Islamist militant group has traded grainy videos for slick productions. This week, Boko Haram posted a video purportedly showing the bodies of two beheaded men accused of spying.

The dramatic admission of guilt by Dzhokhar Tsarnaev's defense team in its opening statement Wednesday has generated questions about the trial now underway.

NPR's Robert Siegel talks to Katherine Meyer, an attorney with the Wildlife Advocacy Project, about how animal advocates are celebrating the end of elephants in the Ringling Bros. circus.

Charley Leundeu Keunang, 43, was shot and killed by LAPD officers during a struggle on Sunday. He had come to the U.S. using a stolen identity.

NASA's Dawn mission has reached its destination and is orbiting the dwarf planet Ceres. It's the end of an odyssey to explore an odd, in-between world.

New England businesses are taking stock after weeks of record-setting winter storms disrupted transportation, stopping many workers from doing their jobs. Telecommuting is helping Boston get by.

In "Mammal March Madness," you win or die. No basketball in this tournament — it's a simulated survival-of-the-fittest game set up by evolutionary biologists. The battle cry? Mammals suck ... milk!

Tens of thousands of unaccompanied minors are moving through immigration courts without legal representation. An ACLU lawsuit calls for the government to provide them with lawyers.