Medicine: Can Science Pick a Child's Sex?

Doctors challenge new methods of granting an ancient wish

It is one of nature's most coveted secrets, and over the centuries many have professed to know it. Aristotle had a surefire formula: make love in the north wind to conceive a male child and in the south wind for a girl. Hippocrates had his own prescription—tie a string around the right testicle to stimulate the production of male seed, or the left, if a daughter is sought. Medieval alchemists had an even more exotic recipe for a son: a precoital drink of lion's blood and...

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