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It's a toxin produced by a bacterium...

Botulinum toxin is the most acutely toxic substance known, with a lethal dose of about 200-300 picogram of toxin per kg of bodyweight. It is the toxic compound produced by the bacterium Clostridium botulinum.

A picogram is One-trillionth (1x10-12 or 0.000000000001) of a gram. This means that 100 grams would be enough to kill all human beings on earth.

Ralph Nader, noted environmental activist, once claimed that plutonium was "the most toxic substance known to mankind", but this is not correct.

Polonium (for example) is more toxic than Plutonium. By mass, polonium-210 is around 250,000 times more toxic than hydrogen cyanide (the actual LD50 for Po is about 1 microgram for an 80 kg person, compared with about 250 milligrams for hydrogen cyanide)

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