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The Centers for Disease Control and Prevention estimates that 1.78 million students in the U.S. have tried electronic cigarettes. Their use has risen dramatically in just one year.

When it came time to cast the most important vote of his brief Senate career, Massachusetts Democrat Ed Markey avoided taking a position. And his vote was all the more puzzling given the circumstances of his election.

Scientists aren't sure exactly why holes form in the hot and glowing outermost layer of gas surrounding the sun. But one theory is that the dark blotches we see on images of the sun could be the remnants of the (relatively) cool splotches called sunspots.

Of all the healthy foods you could eat, what inspires some people to wear kale T-shirts and sport kale stickers? Why do some people see kale as a part of their identities?

Food blogger Deb Perelman did not jump on the kale bandwagon. "I've often thought the world would be a better place if we could stop pretending that kale tastes good," she says. But one salad changed her mind.

The USDA has quietly ended a ban on processed chicken imports from China. The products won't require a country-of-origin label — which means there's no way to know whether those chicken nuggets in the freezer aisle came from a country with a spotty food safety reputation.

President Dilma Rousseff has been irritated by reports that the U.S. spied on emails, phone calls and text messages from her and Mexican President Enrique Peña Nieto. President Obama tried to smooth relations.

Federal lawmakers have been unable to solve a widely acknowledged problem with the formula used to set the pay for doctors who treat Medicare patients. Now, after a series of temporary patches, a bipartisan solution may be at hand.

The new chairman of the Reserve Bank of India infused a sense of much-needed optimism this week, but analysts say the exuberance is unlikely to last. India's economic growth has crashed, its currency has plunged and prices are up. After a decade of high growth rates, India is now the sick man of Asia.

Campaign reporters have "become one giant tweeting blob," grouses CNN political reporter Peter Hamby. In a Q&A, Hamby talks with NPR about how Twitter changed campaign coverage — the promise, the pitfalls and what that means for the next election cycle.