"One nuclear bomb can ruin your whole day." It was true back in the late 1950s, and it's just as true now. The world could end at any moment thanks to the countless nukes out there, just lying around. According to a 2010 Ploughshares Fund report, 22,000 active nuclear warheads are scattered around the globe. And that number doesn't include smaller—and therefore more susceptible to theft—nuclear weapons like atomic artillery shells and bunker busters. In truth, we're still exactly where we've been for the past 70 years: one international argument away from the end of the world.