All the things that you thought you knew? Like that Vikings wore helmets with horns. Or that rice causes birds to explore. Or that Marie Antoinette said 'Let them eat cake'. Yeah, never happened.
John Green of Mental Floss created this video that debunked 50 common misconceptions. Your brain might explode after watching it all. But at least you get to explode other people's brain after. [Mental Floss]