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Scientists know that lead exposure during childhood harms the developing brain and nervous system, but it is not clear if childhood lead exposure has long-lasting effects on adult brain function. Changes in adult intelligence quotients â IQs â is a way to measure effects of lead and other neurotoxic substances.
Exposure to lead is dangerous because this heavy metal is a toxin which can cause severe health problems and death at high levels of exposure. Humans have been working with lead for centuries, and giving themselves lead poisoning at the same time due to a lack of understanding about the risks of lead exposure.