Top 5 Deadliest Substances
The most lethal toxin known to man is produced by the tiny bacterium clostridium botulinum, more commonly known by the disease it causes–botulism. The toxin is so potent that it would only take a crystal of botulinum the size of a grain of sand to kill 9,600 people. Join Hank Green in this edition of SciShow, as he discusses how botulinum and four other deadly poisons attack the human body.
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