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The paralyzing virus had seemed on the verge of disappearing. But this year cases are being reported in 10 countries. The World Health Organization has responded with strict vaccination rules.

Student-led protesters are clashing with the security forces over a range of grievances that include inflation, joblessness, food shortages and high crime. Both sides appear to be digging in.

Around the world, many of us start our day with a drug derived from a natural insecticide: caffeine. Murray Carpenter tells the tale in Caffeinated: How Our Daily Habit Helps, Hurts and Hooks Us.

As 2013 wraps up, NPR is looking at the numbers that tell this year's story. The number 1,134 got us all talking about where our clothes come from, who's making it, and under what conditions. It's the official death toll of the Rana Plaza building collapse in Bangladesh.

The Federal Aviation Administration is under pressure to come up with rules for the commercial use of drones. The central issue: How can they fly safely in the same airspace as other aircraft?