minus-squareobviouspornalt@lemmynsfw.comtoNews@lemmy.world•Human Intelligence Sharply Declininglinkfedilinkarrow-up5·17 hours agoPart of the answer is that mortality rates were far higher 150 years ago. A couple might have 5 children but only 2 survive to adulthood. linkfedilink
Part of the answer is that mortality rates were far higher 150 years ago. A couple might have 5 children but only 2 survive to adulthood.