Final verdict on IQ tests

Have you ever taken an IQ test? Originally envisioned as a way to determine which French children should be locked in asylums, Alfred Binet's attempt to quantify human intelligence took the modern world by storm. Yet, as Ben, Noel and Max ask in this follow-up to lead exposure: How accurate are the IQ tests? Are they genuinely accurate, or, ironically enough... their own sort of dumb?

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