Science: Sex by Sedimentation

Once scientists learned the technique of artificial insemination in both animals and humans, they seemed within possible reach of an exciting goal: selection of the sex of an infant before conception. But how to separate sperm that produce female offspring from those that produce males? Various methods, such as the use of electric fields or care ful temperature control, produced only minimal results. Then, in India, Zoologist Bhairab Chandra Bhattacharya noticed that the upper portion of a sperm sample tended to breed more bulls; the lower portion gave more cows. Apparently this was because the sperm that produce female offspring are...

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