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Suppose a genetic test indicates that your would-be daughter will in all likelihood be smart, beautiful and kind - but will suffer from chronic depression. Wouldn't you want to save her from years of misery by a quick and painless intervention in the test tube? And while you are at it, why not give the child a little push? Life is hard and challenging even for healthy people. So it would surely come in handy if the little girl had a stronger-than-normal immune system, an above-average memory or a particularly sunny disposition. And even if you don't want that for your child - what if the neighbours are doing it for theirs? Would you have your child lag behind? And if the government forbids all citizens from engineering their babies, what if the North Koreans are doing it and producing amazing geniuses, artists and athletes that far outperform ours? And like that, in baby steps, we are on our way to a genetic child catalogue.