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"Improvements in ... are thought to ... however ... potentially because." Are thought to; by who? Potentially because; another weasel phrase. How about "Reasons are unknown, some untested theories are that ..."
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Thanks for sharing some research on IQ’s and the Flynn Effect. A controversial area of research, fraught with minefields of “racism.”
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Maybe it just means the Flynn Effect is an artifact...
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Earlier puberty, kids grow up much faster than in the past, including their brain. "Buttke found that the age when a girl has her first period (menarche) has fallen over the past century from an average of age 16-17 to age 12-13."
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