Environment and IQ

The correlation between adopted brothers and sisters (genetically unrelated people raised together) shows that the IQ correlation between them basically falls to *zero* in adulthood — suggesting shared childhood environment has no impact on intelligence in adulthood. pic.twitter.com/YYMHjKUvOV
— Paolo Shirasi (@PaoloShirasi) December 19, 2022

Well, obviously. Unless we are talking about something like severe persistent malnutrition or brain damage, there’s no manner in which environment can impact the IQ in any way. But it has an overwhelming impact on one’s capacity for happiness.