The concept of a Zombie Apocalypse has been around for a long time. The U.S. government has a protocol for one, its been in many horror films, and many horror games. Well I'm here to tell you why that is all impossible. So, lets start off with a fictitious scenario 90% of the world is infected with a dangerous disease that cause symptoms similar to our zombie stereotype 10% of the world is not infected and are forced to survive in cities, forests, and anywhere they can go to hide from the disease On day 1 of the outbreak, assuming it is an airborne and quite common disease, roughly 10% of the world would be infected. These would be people with low immune systems. The disease would grasp your immune system and pretty much tuck you in to a corner of your mind where you just keep it breathing and stuff. The 90% of "survivors" would be living off of rations, airways and waterways would shut down, and all transportation would be cut off to not spread the disease. The rations would only last a few days until survivors would be pitted at each other for survival. But wait, zombies would have to eat to. Either they eat humans, other zombies or normal food. The disease would first target humans, then other zombies, and never consider normal food. Their numbers would drop immensely in places where there are dense populations, as they infect humans, they are shot, they infect more. Eventually there will be no humans, so now zombies would have to eat each other. Eventually the few zombies left in a matter of 2 weeks would die of starvation. The apocalypse is over in 14 days, not long enough for them to mutate in to giant hulking beasts or spit acid. Survivors would return to cities and everything would be over with a much smaller human population.