It started in 1750 with the first census in France. At that point scientific study of aggregate human statistics became the norm.
Prior to that was the defeat of the plague in 1720, using newsprint to provide advanced warning and quarantine. Once the plague was defeated, the age of survival for children dropped from ten to seven, or so. At that point, parents invested earlier in children and that paid off is creating scientific minds.
I have lots of industrial revolution theories, however.
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