There are millions of chemicals cited in the scientific literature and thousands more are being added every year. There is a lot of uncertainty and debate about the human health impacts of any particular chemical. Of the seven major metals know to Greeks, Mercury has been poisoning its industrial users for thousands of years. The ancients, being no fools, realized the danger and reserved exclusive space in the mercury mines for slaves, convicts and other undesirables. Life was short, and from all accounts, hellish; a miner seldom survived more than three years.
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