Fascinating. I'm reminded of the 'conservation of ninjutsu' trope. We've known for a while that birth rates fall as education rates increase, but this almost su

Fascinating. I'm reminded of the 'conservation of ninjutsu' trope. We've known for a while that birth rates fall as education rates increase, but this almost suggests there's a 'conservation of iq' principle at a population level- you can have growing population or iq, but not both!