demographic transition around the world, 1850 to the present

The "Beta Processes for Roman Era Egypt" themes today caused me to make a few comments about the intriguing dynamic plot shown in the link below: 

Wahrlich, wir leben in ... interessanten Zeiten, with gigantic & fundamental changes in demography and medicine, under our feet. Over as short a time-span as a brief century, two fundamental parameters, Pr(a child dies before age five) and E (number of children), have gone down, super-significantly and super-uniformly.
https://www.facebook.com/groups/1589206911336271/permalink/2347692038821084/