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Scientists are trying to figure out how chemicals in the air interact with each other to make people sick. So they're building an instrument — a "lung in a box" — that goes way beyond the usual chemical monitors.

Nuon Chea, the No. 2 leader in the genocidal Cambodian regime, and head of state Khieu Samphan are on trial for genocide and crimes against humanity during the 1970s.

Some Democrats might snicker at Mitt Romney's desire to be involved in the 2014 midterm election campaigns. While there are limits to his usefulness as a campaigner, he could have an upside for Republicans as a fundraiser.

Marc Fucarlie left the hospital this week, after 45 days of surgeries and skin grafts, induced comas and dozens of tests. His right leg was amputated and it's uncertain how functional his left leg will be. His rehabilitation will take years, and he's worried about how he'll pay for it.

Uganda has lost one generation to a brutal, decades-long war. Now, a second generation is jeopardized by a strange disease known as nodding syndrome, which affects only children in parts of Africa and has no known cause.

As with Hurricane Katrina and Superstorm Sandy, nearly all deaths from hurricanes come from storm surge. The danger isn't well understood by the public, however, so the National Hurricane Center is retooling its forecast and warning systems to better track and alert vulnerable residents.

When an advertiser seems to do everything right and still draws complaints, it makes you wonder: Is there any way to market to diverse communities without stepping on toes?

The viral video shows an adorable toddler struggling with the thought of octopus in his gnocchi. We ask: How did you explain eating animals to your kids?

May was the deadliest month recorded by the United Nations since June 2008.

When you're caught in a tornado's path, should you run or hide? The tornado in Moore, Okla., and the storms that tore through the Oklahoma City area Friday provide contradictory answers.