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The Ukrainian government says it has begun an operation to retake the eastern Ukrainian town of Slovyansk from pro-Moscow militants. Militants there have already shot down two government helicopters.

An action thriller of a symphony, Mahler's First is piled high with ambition, self-reflection and fear. Conductor Marin Alsop shares her approach to Mahler's multilayered music.

In South Florida, the world's two most destructive termite species could be mating because of climate change. Researchers say if the hybrids colonize, they could pose an even greater economic threat.

Amid record production, some analysts worry the U.S. will run out of places to put it all. One says lack of storage space could drive oil down to about $20 a barrel, less than half the current price.

Two physicists keen to detect a a very rare, high energy particle think you and I can help. The researchers are working on an app that would allow any smartphone to detect rare particles from space.

It's related to herpes. And it infects most of the world — about half of Americans, nearly all the developing world. But don't go out and get infected. The virus has a dark side, too.

Nigerians have elected a former military strongman to be their next president. Muhammadu Buhari, who insists he's a changed man, says his first order of business will be to crush Boko Haram militants.

A framework was announced last week to curb Iran's nuclear program. NPR's Rachel Martin speaks with Iranian businessman Rouzbeh Pirouz about how the proposal will affect his business.

Republicans, and many Democrats as well, are skeptical the deal is good for the U.S. and its allies. Because the deal is not legally binding, it does not technically need the approval of Congress.

Some 16 billion jelly beans are consumed every year in the U.S. alone, and every year new flavors hit the market. But the origins of the popular confection are "lost in the mists of time."