Science: Given how we've treated their funding of late, they might just do it on purpose.

PBS's Space Time video blog series ponders whether a routine space mission could accidentally kick off a zombie apocalypse. The answer is no. Of course not. The kicker is the whole reanimation bit: we don't really have any scientific analog for a bacteria or virus that can pull of that stunt yet. At least not in humans. That said, there's a long and interesting bit about how time spent in space has the unfortunate tendency to make existing bacteria and viruses more contagious and deadly. Neat stuff.