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British voters on June 23 will cast what some have called the most important vote of their lives — on whether the U.K. should remain in the European Union. Here's a guide to the main issues at stake.

Economists are working on ways to put a price on the environmental damage of growing food. Take sugar: Half of what we eat comes from beets, half from cane. Each has an impact, in very different ways.

Brown University student Sunil Tripathi disappeared just before the Boston Marathon bombing, and was accused of being involved in the attack. A new documentary looks at the effects of the allegation.

Long before cooking was common, early humans needed extra energy to fuel bigger bodies and brains. Scientists say simple stone cutting tools likely allowed small-toothed meat eaters to thrive.

California regulators say autonomous cars should have a licensed driver, but a top Google engineer says that makes as much sense as putting a steering wheel or brake pedal in the back of a cab.

The Texas senator has largely been out of the headlines after his third-place showing in New Hampshire. But that was not a bad finish for him, and now the calendar is shaping up better for him.

But it said its failures did not directly contribute to the blast, which killed 29 coal miners in 2010.

Roughly half of Facebook's users check in on smartphones and other mobile devices every month, but so far the company isn't making money on mobile. That's one of the potential pitfalls for the company as it prepares to sell its stock to the public.

Former Pennsylvania Sen. Rick Santorum is looking for momentum as Republicans caucus and vote in three states on Tuesday: Missouri, Minnesota and Colorado. And dissatisfaction with front-runner Mitt Romney in Missouri could point to a potential opportunity for President Obama in the fall.

On New Year's Eve, don't open the front door in Denmark, look out for falling furniture in Italy and chew lightly when eating black-eyed peas in the South of the U.S.