Whew! What a relief. I know I was laying awake at night worrying that vampires were gonna git me!
Some scientist, who has obviously not read a lot of vampire lore, decided that for the sake of people everywhere he had to prove that vampires could not possibly exist. Really, you gotta read that link!
So he used math, and a lot of assumptions.
Now, I am no scientist, but even I can see gaping holes in his logic.
And, nobody tell The Guy that he is working on debunking zombies, too.
h/t to Whedonesque.