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    $\begingroup$ Great answer! But Google translate gives "All things are poison, and nothing is without poison, but the dose makes that a thing is not a poison" for your quotation. I don't know German though so I can't verify it in that case I leave the discretion upto you :) $\endgroup$
    – Gaurang Tandon
    Commented Jan 14, 2018 at 14:55
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    $\begingroup$ @GaurangTandon That's correct, but the version I put up is the better known one ;-) $\endgroup$
    – paracetamol
    Commented Jan 14, 2018 at 14:56
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    $\begingroup$ @GaurangTandon Since NatGeo hasn't been taken down, I'll assume they just mentioned that incident (if it ever happened), and not demonstrated on live T.V. That said, if that incident did occur, I suspect the chap never did intend to die, it's just that the path of Science is a long and dangerous one (1) (2) (3) O:) $\endgroup$
    – paracetamol
    Commented Jan 14, 2018 at 15:11
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    $\begingroup$ Note that culture testing is prone to false positives. For example, a culture test would conclude that theobromine and ethanol are deadly poisons, because a tissue culture doesn't have a liver. Further, it would conclude that a number of substances are deadly neurotoxins, when in fact they're harmless to humans because they can't cross the blood-brain barrier. $\endgroup$
    – Mark
    Commented Jan 14, 2018 at 20:55
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    $\begingroup$ Of course, the only way to get an accurate LD50 ... for a human is to actually poison someone. Actually rather a lot of people, as it's a statistical measure $\endgroup$
    – Chris H
    Commented Jan 15, 2018 at 10:05