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According to legend, once a vampire bites a person, that person turns into a vampire who seeks the blood of others. A researcher came up with some simple math, which proves that these highly popular creatures can’t exist. University of Central Florida physics professor Costas Efthimiou's work breaks down the myth. Suppose that on January 1st, 1600, the human population was just over five hundred million. If the first vampire came into existence that day and bit one person a month, there would have been two vampires by February 1st, 1600. A month later there would have been four, the next month eight, then sixteen, and so on. In just two-and­-a­-half years, the original human population would all have become vampires with no humans leaving. But look around you. Have vampires taken over the world? No, because there’s no such thing.