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1. I don't believe the heat idea. Nor the superior genes one.
2. That doesn't make "these cities existed without air conditioning" a good argument in this thread. Yes, they did. No, that doesn't debunk the heat/IQ linkage idea.
2. That doesn't make "these cities existed without air conditioning" a good argument in this thread. Yes, they did. No, that doesn't debunk the heat/IQ linkage idea.
I'm skeptical of the IQ heat idea - it'd be readily demonstrable if it existed - but the numbers available, particularly outside the US/Europe, are largely current/recent, not from pre-1950s.