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The deadly threat affecting millions — and how to prevent it | Drew McCartor
Where this was said
The Intelligence Curve Argument: Lead Is Engineering a Less Capable Humanity
At 15:20 · chapter starts 14:30
The individual story of Saim is devastating. But McCartor wants the audience to grasp what 1 billion versions of Saim means for humanity [1] — Drew McCartor "At current average exposure levels, lead is sufficient to shift the global intelligence curve downward — cutting in half the number of chil…" 14:30 . In low- and middle-income countries, he explains, the average child's lead exposure is high enough to subtract 4 to 5 IQ points from their development — a number that, applied across entire populations, is enough to shift the intelligence curve downward for the whole generation. The downstream effects are not abstract: the number of children with IQs above 130 — the gifted tier — is cut in half. And the number of children with IQs below 70, the threshold for intellectual disability, increases by 50%. These are not edge cases or statistical curiosities. These are the scientists, artists, engineers, and leaders the world will never have — and the number of people who will require lifelong support who didn't need to. McCartor closes the section with his most memorable line: 'If you rob one child of their potential, that's a tragedy. But to do it to a billion kids, that changes the trajectory of humanity.' Then, a pivot: 'OK, that's all the bad news. Now the good news: this thing is solvable.'
At current average exposure levels, lead is sufficient to shift the global intelligence curve downward — cutting in half the number of children with IQs above 130, and increasing by 50% those with IQs below 70. We are engineering a less capable humanity by inaction.
Lead exposure at current average levels is sufficient to cut in half the number of children with an IQ above 130, effectively halving the pool of gifted children.
