Here's a brief lesson on how Zombies could actually happen:
1. Stem Cell Transplants- I doubt the idea of bringing dead people back to life with SCTs is a good idea. I mean what will an undead person be like? Will they remember who they are? It's worked on rats and soon they will start doing on rich dead people.
2. Mad Cow Disease and Rabies- Okay, I know technically this isn't a Zombie but if there was a huge outbreak of one of these it would pretty much be the same thing. Like in that movie Zombie Land: Mad cow disease became mad people disease which became mad zombie disease.
3. Parasites- certain parasites have been known to be able to control the mind of rats, who basically have the same anatomy as us. You can do the math.
