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There's really no such thing. There are lots of different extraordinarily toxic compounds. Some possibilities are listed below with the minimum quantity required to cause death in parentheses: * ricin (500 mcg if injected, about half a grain of sand) * tetrodotoxin (also about 500 mcg if injected) * dimethyl Mercury (0.1 ml when absorbed by vapours or skin contact, passes right through latex or neoprene gloves)

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16y ago

What else can I help you with?