Zombie Mathematics
Earlier this year a group of mathematician from Canada published a paper in the journal "Infectious Disease Modelling Research Progress" examining the ability to model a zombie apocalypse using current infectious disease models (with a few modifications). What they determined was that if zombies were to exist (without a cure or massive military action, which they also looked at) then the only outcome was everyone becoming a zombie. To use more technical terminology, the only stable equilibrium was all zombie. In their analysis they found this to be true with a virus (or whatever) that acted quickly, slowly and if they included quarantine of the infected/zombies as well. The only situations where it might be possible (according to their study) to survive a zombie apocalypse was if 1) there was a cure developed (although the world would be mostly zombies) or 2) if you had a group of survivors and were able to use the military to attempt to kill off every zombie (which I would have liked the authors to bulk up a little more).