Interestingly, though, your PNAS article says the recent downtrend in IQ is environmentally caused and claims to rule out dysgenic fertility as the driver: > t

Interestingly, though, your PNAS article says the recent downtrend in IQ is environmentally caused and claims to rule out dysgenic fertility as the driver: > the large changes in average cohort intelligence reflect environmental factors and not changing composition of parents, which in turn rules out several prominent hypotheses for retrograde Flynn effects.