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COLOGNE, GERMANY - JUNE 24: A frog observes proceedings during the second round of the BMW International Open at Gut Larchenhof on June 24, 2016 in Cologne, Germany. (Photo by Stuart Franklin/Getty Images)

From Viking helmets to goldfish only having 3 seconds of memory, to frog warts, to swimming after you eat, the 50 most common misconceptions people have about the world.