There’s just around 170 milligrams – somewhere between the mass of a one-carat diamond and the amount of caffeine in a Monster Energy Drink. That’s how much batrachotoxin (BTX) is left in the world, according to the most recently available figures. Found in the skin of the golden poison dart frog Phyllobates terribilis, this toxin is so potent that one milligram of it would be enough to kill between 10 and 20 humans.
Physicians in ancient Egypt proved to be masters of dentistry and had already learned how to craft effective dental bridges. According to the British Dental Journal, on several occasions early dental bridges were discovered on ancient Egyptian skulls, and three of the teeth are on display at various museums with evidence of the bridges still in tact.