"... than a child from a professional family. And the disparity mattered: the greater the number of words children heard from their parents or caregivers before they were 3, the higher their IQ and the better they did in school. TV talk not only didn’t help, it was detrimental."
There are some big correlation/causation problems lurking in there, obviously.
"By age 3, a poor child would have heard 30 million fewer words in his home environment..."
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