It sounds like the origin story of a superhero, but there's nothing fictional about what Tim Friede's accomplished. Since 2001, the 57-year-old Wisconsin man has let himself be bitten by venomous snakes some 200 times,

Scientists hope to make a universal antivenom from the extraordinary blood of a man exposed to snake venom for decades.

Scientists identified antibodies that neutralized the poison in whole or in part from the bites of cobras, mambas and other deadly species.