Boy? Girl? Up To You

The long-sought ability to choose a baby's gender may finally be a reality

The impulse to choose a baby's gender is probably older than human history, and prospective parents have tried no end of ingenious ways to do it. In ancient Greece, men would lie on their right side during sex to guarantee a boy; in 18th century France they would tie off their left testicle for the same result. Medieval Germans preferred to put a hammer under the bed to produce a boy, while their Danish cousins placed scissors there to make a girl. None of it worked, of course, and despite impressive advances in other aspects of reproductive science, modern medicine hasn't...

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