Zoltan Takacs collects venom, and lots of it—but don't worry, he has a good reason. The Hungarian-born adventurer, biomedical scientist, and inventor uses "cutting-edge genomics" to create "combinatorial venom libraries" of toxic venom from snakes, scorpions, jellyfish, and other animals for research on new medicines. He’s also allergic to both snake venom and antivenom, so it's safe to say he's a risk-taker. Find out more at Deadliest Lifesavers, presented as part of the National Geographic Live series, which shares the efforts of its diverse, adventurous contributors.