The end of the world is coming... eventually. But for more than half a century now, a global team of scientists have been getting together to try and tell us all just how close we are to the end. Since 1947, the Bulletin of the Atomic Scientists has maintained a measure of humanity's proximity to the brink called the Doomsday Clock, which is absolutely not as cool as it sounds when you first hear about it. Is it even a real clock? (No.) Can it predict the apocalypse? (It can't.) Does it have any use at all? (Actually... well, watch the video.) From its symbolic origins to its current status measuring many metrics of humanity, this is the scary history of the Doomsday Clock.