Science has pretty much changed our world … mostly for the better. But there's a dark side to this field and some scientists chose to leave their ethics at the door before conducting some of the most controversial experiments in human history.
This mad scientist applied conducting rods on hung murderer George Forster's rectum and used electricity to essentially reanimate him in front of a live audience. The corpse started to punch, kick and flinch. Eventually his left eye popped open from the stimulation, horrifying one spectator to death shortly after.
In 1954, Vladimir Demikhov grafted the head of a puppy onto a German shepherd's neck. Eventually, the animals died from tissue rejection. But the Soviet surgeon managed to create 19 more of these pet Frankensteins.