Costas Efthimiou, a physics professor at the University of Central Florida, has done the math.
Legend has it that vampires feed on human blood and once bitten a person turns into a vampire and starts feasting on the blood of others.
Efthimiou’s debunking logic: On Jan 1, 1600, the human population was 536,870,911. If the first vampire came into existence that day and bit one person a month, there would have been two vampires by Feb. 1, 1600. A month later there would have been four, and so on. In just two-and-a-half years the original human population would all have become vampires with nobody left to feed on.
If mortality rates were taken into consideration, the population would disappear much faster. Even an unrealistically high reproduction rate couldn’t counteract this effect.
“In the long run, humans cannot survive under these conditions, even if our population were doubling each month,” Efthimiou said.