Researchers may have found the key to creating the ultimate snake antivenom, and all it took was someone getting bitten 200 times.

Scientists have created what they believe to be the most broadly effective antivenom to date — and its key ingredient came from a single man's blood. Both the researchers and the donor reveal how it all came together.

Tim Friede might be the world's most snakebit person—and his antibodies could hold the key to a truly universal snake antivenom.