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Eating Arsenic
In the 19th century and earlier, some people consumed arsenic to “produce a blooming complexion, a brilliant eye, and an appearance of embonpoint. There were safety rules, of course: You were only supposed to take it while the moon was waxing, and you could only eat only a dose as big as a single grain of millet at first. If you took more than that before you built up a tolerance, you could die.