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Atmospheric scientists, pinning down chemical processes behind Beijing's pollution, discovered an explanation for the unusually toxic smog that killed thousands of people in London in December 1952.

Protests against the Dakota Access Pipeline have been raging. Tribe leader Dave Archambault II says he's telling supporters "not to react to any form of aggression that law enforcement brings."

The risk posed to mammals — and to public health — is well-documented. But for some people, bush meat is an important part of their daily diet.

A century ago, people relied on nature to make basic things: toothbrushes were made of silver, combs were made of ivory, and clothes were made of cotton. In a lot of ways, life as we know it today, is possible because of plastic. We can now afford phones, computers and medical devices in part because of one chemist's discovery a century ago. But his descendants have some regrets.

People are playing Pokemon Go while behind the wheel — and then tweeting about it. And causing crashes. Immersive games like this can be even more dangerous than texting, researchers say.

The president-elect called the alliance "obsolete" and said European countries weren't paying their share. This has created hand-wringing in the bedrock institution of Western security.

Oh no, I touched my face! Uh-oh, I sat on a bed. A hackathon is developing a video game to train doctors and nurses volunteering for Ebola duty in West Africa.

Everyone presumes that soap is clean, but manufacturers know it's always got a few random germs in it. Most of the time that's not a problem, but every now and then things can get out of control.

In 2004, Jin was one of the first Asian-Americans to drop a major label rap album. One controversial song, "Learn Chinese," raised eyebrows. A decade later, he's trying to rephrase the message.

Syria's refugees are waiting for a new life. The artists among them are depicting this life in limbo — and their memories of the country they left behind.