Lead is prevalent on earth. It has been known to be toxic to humans as early as 2000 BC. It is in our air, water, and food. Dioscerides wrote, “Lead makes the mind give way.”1)https://www.lead.org.au/history_of_lead_poisoning_in_the_world.htm Current research finds a positive association between low blood levels of lead and ADHD in children.
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