Zombie stories are terrifying, but most people feel safe knowing that zombies themselves aren’t real. Well, not so fast, people. While the movie zombies from Night of the Living Dead and 28 Days Later might not be coming to get you anytime soon, there are plenty of organisms, toxins, and parasites that are creating forms of zombies every day. Could a day come when one of these things starts zombifying humans instead of small brains? Or maybe a new medical technology will run out of control and start turning unsuspecting people into zombies? (The answer is “Probably.”) The day of a zombie apocalypse could be a lot closer than we…