> Old calculus: "I need to have lots of children so they support me in my old age. No matter the cost." You forget that old calculus also included "Eh it's bar

> Old calculus: "I need to have lots of children so they support me in my old age. No matter the cost." You forget that old calculus also included "Eh it's barely worth learning their names until they're 5 years old". In 1900 child mortality under 5 was 35%! In 1800 it was almost 40%. -> https://en.wikipedia.org/wiki/Child_mortality#/media/File:Global_child_mortality_over_time.png https://en.wikipedia.org/wiki/Child_mortality#/media/File:Gl... You needed 3 babies just to make 2 toddlers. Let alone adults.