Given the sharp decline in blood lead levels after the phase-out of leaded gasoline, lead exposure may seem to be a relic of the past. The reality is quite different, however. In a recent study by Bjorn Larsen and Ernesto Sánchez-Triana, the cost of lead exposure to the global population has been set out in data that are nothing short of shocking. The Study – What Did They Actually Do? Let's dissect it. Larsen and Sánchez-Triana intended to know the worldwide toll and economic cost of lead expos
IQ is a very poor measure of intelligence and mostly shows your aptitude for taking the type of test they give to measure IQ.
You could be an absolutely brilliant Amazonian hunter-gatherer and you would fail every IQ test.
Hell, I knew a guy- so illiterate that he could barely sign his own name- but he was one of the best fiddle players I ever saw. Was he smart or stupid?
This is not to downplay the effect of lead on intelligence, I’m not saying it’s not there, I’m just saying this is a bad metric.
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