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Two large radio telescopes have detected very brief, powerful bursts of radio waves, and so far, scientists have no idea what's causing them.

The 29-year-old cyclist will become the first Italian to wear the yellow jersey into Paris since Marco Pantani in 1998. This year's event was marked by favorites dropping out early on.

Kiev's forces have been advancing on key rebel stronghold in hopes of forcing a collapse of the separatist movement.

Alexander the Great complained about the tunnels under Gaza during his siege of the area in 332 BC. They are still an issue today as the Israelis and Palestinians slug it out.

NPR's Eric Westervelt speaks to OZY reporter Pooja Bhatia on the economics of choosing to pay any price you want.

NPR's Corey Flintoff, reporting from Donetsk, Ukraine, says government forces appear to be gaining ground against rebels who control the wreckage site.

Fighting in the country's east has killed at least 38 people since the U.S. on Saturday temporarily closed its embassy in the capital, citing security concerns.

A researcher has complained that coverage in NPR and other outlets ignores his work and gives undue credit to a sixth-grader's project. But that sixth grader did make an original contribution.

Songs that teach and delight students of all ages.

The State Department says the photos show burn marks from the firing of multiple rocket launchers inside Russia and resulting craters on the other side of the border.