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When is a migrant a refugee? The answer comes down to how U.S. judges read one sentence in a 1980 law. Each ruling could mean the difference between life and death for thousands of Central Americans.

When is a migrant a refugee? The answer comes down to how U.S. judges read one sentence in a 1980 law. Each ruling could mean the difference between life and death for thousands of Central Americans.

Over 20 people have been sickened in two new outbreaks of foodborne illness linked to alfalfa sprouts. For something many deem a "health food," sprouts continue to be a vexing food-safety challenge.

Airlines have been paying the lowest prices in years for jet fuel. Nevertheless, fares are rising and many fuel surcharge fees remain. Traveler advocates are angry but airlines say labor costs are up.

After the deal was announced, Sharp's stock fell more than 14 percent. And Foxconn now says it will postpone finalizing the sale due to late-arriving information.

In the city of Qom, ayatollahs and hardliners fret that their government relinquished too much in its nuclear deal with the U.S. and other world powers. "God knows what we gave up," says an ayatollah.

You nominated 300 cool stories of scientific surprise for Skunk Bear's Golden Mole Award. Our shortlist has it all: circuits painted with light, imperceptible genitalia, and a terrifying frog.

Mobile phones that double as stun guns. Smart bikes connected to an app that can deter thieves and track your workout. We got an eyeful of futuristic gadgets at a mobile tech conference in Barcelona.

Researchers say Colombia offers a chance to learn more about Zika's possible link to microcephaly. If the country sees a sudden rise in cases as Brazil did, that's stronger evidence of a connection.

Astronomers have known about the powerful pulses but had never been able to catch one in the act to help figure out what's producing them. Last year, they got one.