I was listening to the lecture at Grescham college about arsenic. I fell asleep after they started talking about the massive but accidental poisoning of Bengladesh, caused by ground water in deep wells which has a high arsenic level. (the deep wells were dug to stop the high death rate of dysentary in children, and they did solve this problem).
But I also ran across this item:
Ancient mummies in Chile also show arsenic poisoning.
People of numerous pre-Columbian civilizations in northern Chile, including the Incas and the Chinchorro culture, suffered from chronic arsenic poisoning due to their consumption of contaminated water, new research suggests.
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