What do you mean they are in fact real? Where? Show the proof.You do know that zombies are in fact real right? They might not be the same versions as you see in the Day of the Dead, but they still zombies or slaves for that matter.
Also, how do you know it's impossible, are you God? Do you know everything that known and unknown science can do and can't do? If so, call me a prophet and let me a start up a religion that worships your all knowing self.
I'm not worried, am just replying to a post.
The point I am making is that is impossible under current science, which means that it's very very unlikely to happen.
Zombie apocalypse nutters should just get on with their life, there are better things to worry about such as decreasing amounts of fuel.