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When then Harvard University president Lawrence Summers suggested in 2005 that innate differences between men and women may account for the lack of women in top science and engineering positions (and subsequently resigned), he was referring to the greater male variability hypothesis. Women, it holds, are on average as mathematically competent as men, but there is a greater innate spread in math ability among men. In other words, a higher proportion of men stumble mathematically, but an equally high proportion excel because of something in the way male brains develop

Today expectant parents concerned about the diseases that could afflict their unborn children don’t have a lot of options. Blood tests can determine whether parents carry mutations for such genetic diseases as cystic fibrosis and Tay-Sachs, but they can’t determine whether the baby will inherit them