"And so, they go from the 18th century of [the upper class] having three children per
family, per person, down to having one by the time we get to the decade
of the 1850s."
Ah yes, the 1825-era progesterone pill.
It was such a black site op even the people taking it didn't know they were taking it.
P.S. It really is a night and day difference between professionals and amateurs. Knowing things vs. knowing buttfuck all. There's no gradient.