In the first two months of Left 4 Dead 2's release, 28,981,249,043 zombies have been shot, bludgeoned, chainsawed and killed or, for our younger readers, taken to a farm where they can frolic and shuffle around forever. You read that correctly: 28 BILLION. To put that number in perspective: The entire population of the planet has been zombified and killed 4.26 times. With the average height of a zombie being 6 feet, if you stacked them end to end they would circle the globe 1,322 times. If you placed 28,981,249,043 rulers end to end, they would reach 28,981,249,043 feet in the sky. In short: That is a bucketload of dead zombies. Nice job, everyone.