It's 0.4 in childhood, rising to 0.7 to 0.8 in adulthood. Saying that you can adopt a child and raise him to be smart is approximately as foolish as claiming y

It's 0.4 in childhood, rising to 0.7 to 0.8 in adulthood. Saying that you can adopt a child and raise him to be smart is approximately as foolish as claiming you can adopt a child and raise him to be tall.