What doesn't kill you can make you stronger. Science has unlocked the human body, enabling us to survive diseases and infections. We've gone from finding antidotes to using the poisons themselves as a cure; the most poisonous toxin known to man - Botulinum - is now used as an Anti-wrinkle drug called Botox. Scorpion venom is even being tested for the treatment of life threatening diseases. Favorite public television presenter Michael Mosley is our guide to the fascinating series.