If vampires—corpses that rise up to suck the blood of the living—sound biologically implausible to you, you’re not alone. They exist purely in legend, as virtually all scientists agree.

But for any vampire believers un­dissuaded द्वारा biological facts, a professor has come up with a sec­ond proof of their unreality, using math.

If वैंपायर ever existed in the forms in which फिल्में and पुस्तकें portray them, they would have quickly wiped out humanity long ago, ac­cording to physics professor Cos­tas Efthimiou of the विश्वविद्यालय of Central Florida in Orlando, Fla.
लोकप्रिय lore passed down through centuries holds that vampire vic­tims become वैंपायर them selves, and launch their own blood-hunts on hapless humans.

To rule out vampires, Efthimiou re­lied on a basic principle known as geometric progression.
“If वैंपायर truly feed with even a tiny fraction of the frequency that they are depicted to in the फिल्में and folklore, then the human race would have been wiped out quite quickly after the first vampire ap­peared,” Efthimiou and a graduate student colleague wrote in a paper पोस्टेड on line.
Efthimiou supposed that the first vampire arose Jan. 1, 1600, around the beginning of a century during which some of the first important modern writings on वैंपायर appeared. There searchers estimated the global population at that time, based on historical records, as 537 million.

Assuming that the vampire fed once a महीना and the victim turned in­to a vampire, there would be two वैंपायर on Feb.1, four the अगला month, and eight the महीना after that. All humans would be वैंपायर with in 2½ years. “Humans can not survive under these conditions, even if our population were doubling each month,” which is well bey­ond human capacities, Efthimiou said.

But why would one vampire make every महीना a new vampire, when he can easily drink his hole blood,
and human would die?