Nerds. Sheesh.

"The mathematicians have also failed to take into account the mass of Santa's sleigh. Given the combined mass of all presents (assuming each good non Muslim kid gets a 500g Lego set) multipied by the velocity (he needs to travel in order to visit every house) squared, you have a behemoth amount of kinetic energy dissapated as heat. Match that up against the opposing wind resistance Santa and his reindeers would literally burn up in our atmosphere. So if Santa ever existed, he's dead now."