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Scoop.it!
By comparing the testosterone levels of five-month old pairs of twins, both identical and non-identical, researchers were able to establish that testosterone levels in infancy are not inherited genetically but rather determined by environmental... TESTOSTERONE: http://www.scoop.it/t/science-news?tag=testosterone 
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Scoop.it!
In frightening situations, people tend to freeze, but not recent moms, who charge ahead.
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