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Two years ago Colombia pledged to stop exploring for new oil, gas and coal. On the world stage, this was a big deal. Here's what's happened since.

On Capitol Hill today, politicians are holding yet another hearing about the risks of mercury. It's part of the latest wave of concern about mercury, which also turns up in fish, air pollution and in some vaccines. As NPR's Jon Hamilton reports, these fears have been around for hundreds of years.

Prashant Baid created halfloafnear.me for himself; he hates throwing out bread that's gone bad. But now, he says, the program has struck a chord with other people seeking to reduce food waste.

The delicate art of paper folding is playing a crucial role in designing robotic artificial muscles that are startlingly strong. The design uses a soft material and could be safer around humans.

The milestone makes the 41-year-old NASA probe just the second human-made object, after Voyager 1, to reach such distant regions. Now, Voyager 2 is over 11 billion miles from the sun — and counting.

A squirrel wondering if it's safe enough to forage for food apparently listens for the reassuring chatter of nearby birds, a study finds.

In December 1997, a tiger prowled the outskirts of a small town in Russia's Far East. In his book The Tiger, John Vaillant re-creates the events of that terrifying winter in an environment where man and tiger live side-by-side.

Investigators in Italy are analyzing the cruise ship's data recorder to determine how and why the vessel veered off course and collided with a rocky reef off the coast of Tuscany. More than a dozen people are unaccounted for.

Carved zigzag marks on a shell found more than a century ago have drawn new interest from archaeologists. The half-million-year-old lines aren't from an animal, and might be art from Homo erectus.

An associate dean of Illinois State University's Milner Library said his recent trip to the Gulf state of Qatar to help create that country's national…