Fertility is negatively correlated to IQ:
https://www.sciencedirect.com/science/article/pii/S016028960...
"There were strong negative correlations found between national IQ and three national indicators of fertility."
https://www.sciencedirect.com/science/article/pii/S016028960...
"There were strong negative correlations found between national IQ and three national indicators of fertility."
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