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Nova reveals how venom causes the body to shut down, arteries to bleed uncontrollably, and limbs to go black and die. But nature's most destructive and extreme poisons could contain the building blocks for a new generation of advanced drugs that could treat heart attack, stroke, diabetes, obesity, and cancer. Follow two scientists on their expeditions to track down and capture the planet's most deadly creatures, risking life and limb just to tease out milligrams of venom and get it to the lab.