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Old 12-18-2016, 02:47 PM
John Mace John Mace is offline
Join Date: Dec 2002
Location: South Bay
Posts: 82,512
Originally Posted by md2000 View Post
The general rule of thumb that I've read is you are 50% genetic and 50% environment (because deep down, nobody has a serious answer).
I've never hear that "rule of thumb" before. Where does it come from?

At any rate, it doesn't make any sense since a severely malnourished infant could have permanent brain damage and severe reduction in cognitive ability. Same with deprivation of oxygen or exposure to some pathogens.