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U.S. intelligence officials claim that North Korea was centrally involved in the hack against Sony. That's major news in the world of cyberwarfare, where nation-states typically make covert attacks.

Polar bears continue to take a hit in regions with the greatest loss of snow and ice, the latest report card on the Arctic shows. Meanwhile, plankton are thriving as the sea heats up.

Both Stephen Colbert and Craig Ferguson end their late-night TV shows this week. Colbert is getting a boatload of attention as he moves to succeed David Letterman, but Ferguson deserves some too.

Public health has a way of slipping off the radar when people aren't scared about Ebola or anthrax. But that doesn't mean the threats go away. And most states aren't prepared for the next one.

A new report looks at the top causes of death in 188 countries. Infectious diseases are less of a threat than in 1990 — but please, look both ways before you cross the street.

If you plan on traveling to Cuba, you'll be able to bring back $100 worth of the country's famed cigars. But that's not a lot — because they're actually kind of expensive.

The White House won't confirm North Korea is behind the attack, citing an ongoing investigation. Nevertheless, it is mulling over its options.

President Obama says the U.S. and Cuba will normalize relations, which were severed in 1961. Here are images that highlight the decades of tense relations.

In exchange for tax breaks, nonprofit hospitals provide assistance to poor patients. But some hospitals seize wages from poor patients with unpaid bills — even those who qualify for reduced-cost care.

Many business books try to help you get rich quick. But three of 2014's biggest sellers focused on unfairness and inequality. Economists say expect more: Books on inequality are riding a huge wave.