daydrinkingchickadee@lemmy.ml to Memes@lemmy.ml · 15 天前Soonlemmy.mlimagemessage-square98fedilinkarrow-up1765arrow-down154
arrow-up1711arrow-down1imageSoonlemmy.mldaydrinkingchickadee@lemmy.ml to Memes@lemmy.ml · 15 天前message-square98fedilink
minus-squaredaydrinkingchickadee@lemmy.mlOPlinkfedilinkarrow-up4arrow-down7·14 天前Cliodynamics and Structural-Demographic Theory suggests cycles of 200-300 years as well.
Cliodynamics and Structural-Demographic Theory suggests cycles of 200-300 years as well.