Hart and Risley’s Three Key Findings:

May 19, 2010 · A U.S. toll of $14 would be $47 in Japan, unless there's a bridge to cross and then it jumps to $97. ... Overall, the children showed striking gains in IQ test scores from early childhood to adolescence, from a mean score of 77 to 91 (14 points or almost one standard deviation on a test with a mean of 100 and a standard deviation of 15 ... ................
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