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Long before it fueled moviegoers, popcorn helped lay the foundation for the Aztec empire. In our video, we look at popcorn under a microscope, where the rock-hard kernel's fluffy secret is revealed.

Without the deal, Obama told Afghan President Hamid Karzai this week that the U.S. will move ahead with plans to pull all U.S. troops out the country by the end of 2014. NATO plans to follow suit.

Also Thursday, ousted President Viktor Yanukovych says he's still Ukraine's leader and asks Russia to protect him. Along the border, Russian fighter jets are on patrol.

Thursday's economic news isn't great. More people applied for unemployment benefits and demand for some factory goods was down.

We analyzed pizza prices from around the country to answer a simple question: How much does a pizza cost in your neighborhood?

The electric-car company wants to build a massive plant in the U.S. to churn out 500,000 vehicle batteries a year. That's more than the combined current production at all the factories in the world.

President Obama is launching a new initiative aimed at helping young black and Hispanic men. He'll sign an executive order that sets up a task force to help keep them in school and out of prisons.

Nutrition panels just got a big makeover from the Food and Drug Administration. First lady Michelle Obama is announcing the changes on the fourth anniversary of her campaign to fight obesity.

Audie Cornish and Melissa Block read letters from listeners about genetic experiments and the tenuous hopes for voice-banking.

New research finds that nearly one-third of full-time workers do most of their work remotely. But just who those workers are — and how much work they're doing — may come as a surprise.