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The opposable thumb you use to hold a pencil was long thought to be a defining aspect of humans. But an analysis of finger bones suggests stone tool use by pre-humans — perhaps 3 million years ago.

Mexico is inaugurating a new elite police force, a gendarmerie of 5,000 highly trained officers. The force was a campaign pledge by President Enrique Pena Nieto. His administration has touted a decrease in violent crimes, but despite the dip, the rate of kidnappings is up in many of the country's states.

A new outbreak of Ebola is being reported in the Democratic Republic of Congo. But scientists say it's not related to the Ebola epidemic going on in West Africa.

Tristan Walker, founder and CEO of Walker & Co. Brands, and J.J. McCorvey, a writer at Fast Company, discuss the tech industry's diversity problem.

It's the most dramatic change in the wake of the newly discovered virus, which has so far infected some 500 individuals and killed 17. Will it help stem the outbreak?

The closure in 2013 of access lanes to the George Washington Bridge infuriated motorists and jeopardized public safety. When it turned out it was a political vendetta, it became a criminal case.

The failure of this year's Iowa caucuses was years in the making, some technology specialists argue, in part because of the haphazard way political users buy software.

NPR's Mary Louise speaks with Michael Schneider, executive editor of IndieWire, about the Olympics as a TV event this year. It'll be a year without Matt Lauer and Bob Costas.

German women have achieved top political positions, but in the business world, progress has lagged. Until 1977, married women had to receive their husbands' permission to work outside the home.

Democrats will hold the first of two nights of presidential debates in Detroit Tuesday night, as they struggle to differentiate themselves from a wide field and articulate a vision for America.