I am quoting a paragraph from 'Red Queen' on gender selection. Does anyone know what this technique is? "The poultry industry is even more desperate to learn how to breed chickens that lay eggs that hatch into chicks of only one gender. At present it employs teams of highly trained Koreans, who guard a *close secret* that enables them to sex day-old chicks at great speed (though a computer program may soon match them^73). They travel all over the world plying their peculiar trade. It is hard to believe that nature is simply unable to do what the Korean experts can do so easily." It would be interesting to know any clue what this secret is all about...