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Sklivvz
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Tweeted twitter.com/#!/StackSkeptic/status/246941978477076481
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Quassnoi
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Does one drop of nicotine kill a horse?

There is a popular aphorism in Russia, translated as "one drop of nicotine kills a horse":

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, which is widely used on the anti-tobacco posters etc.

Can 0.05 ml of nicotine really kill a healthy 400-kg horse? What could be the origin of this phrase?