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Justin Bieber's singer-actress girlfriend became a celebrity investor by putting her stamp of approval on a postcard start-up. There's another celebrity investor on the block: actress-singer Selena Gomez. The 19-year-old joins a handful of former MySpace executives, among others, in a $750,000 angel-investment round for Postcard on the Run.

The U.S. Marshals Service

Just like our animal skin–clad ancestors, we gather food with zeal, lust over the most capable mates, and have an aversion to scammers. And we do still wear plenty of animal skins. But does more separate us from our Stone Age forebears than cartoonists and popular psychologists might have us believe

Is the founding of Twitter the stuff of "The Social Network 2"? You probably know the story by now

Alexandra Mor had been eyeing the stone for weeks: an 85.30-carat, cabochon-cut emerald about the size of a plump strawberry. Mor, a jewelry designer in New York, was hesitant to purchase it because its color was uneven and it was dappled with inclusions.