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Retailers are using apps to report thefts and suspicious activity. NPR's Kelly McEvers talks to Terrence McCoy of the Washington Post about how that cooperation doesn't necessarily mean safer streets.

A hot air balloon crash in Texas on Saturday killed all 16 people aboard. The cause is not yet clear, but revelations about the pilot are raising questions about the licensing of balloon operators.

Scientists were studying the properties of the light coming from a quasar — one of the brightest objects in the universe — when the light just seemed to wink out. Now they think they know why.

American and United — the airport's two major carriers — reached agreement with O'Hare to build a new runway, which will complete a decade-long modernization project.

Hillary Clinton flew with the president on Air Force One to North Carolina. "Everybody can tweet," Obama said. "But nobody actually knows what it takes to do the job until you've sat behind the desk."

A rare 475-pound leatherback sea turtle "immediately responded to treatments" of fluids, vitamins and antibiotics after it was rescued in South Carolina on Saturday.

The daily pill, called Addyi, modestly increased women's interest in sex in clinical tests. The approval was praised by some women's advocates as a milestone and condemned by others as irresponsible.

Lead exposure lowers children's IQ and causes aggression. But children exposed to low levels of lead show different symptoms, including more depression and anxiety, a study of preschoolers finds.

The Russian military is plagued by problems: A top heavy senior officer corps and a defense industry that churns out obsolete equipment, to name just two. Analysts in Russia say the U.S. should be worried about a weaker Russia, which may be becoming a front line in the battle against Islamist extremism.

MVP Stephen Curry led his team to a milestone victory with a 111-17 win over the Los Angeles Lakers on Tuesday. The Warriors have now won 16 games in a row.