IT’S the exception that proves the rule. A massive genetics study involving over 21,000 people has revealed the best evidence yet that a single gene can raise IQ – but the effect is so small that it leaves intact the idea that variations in intelligence depend on the effects of hundreds of genes.
There is little dispute that genetics accounts for a large amount of the variation in people’s intelligence, but studies have consistently failed to find any single genes that have a substantial impact.
That has now changed, following a brain study on an unprecedented scale designed to…
