As long as it’s healthy!’ Up until now, this cliché was merely a generic – if somewhat ominous – way for expecting parents and their loved ones to talk about their future children. But what if that outcome was not merely an expression of wishful thinking, but something that parents could control? Imagine a fertility doctor examining the embryos that could develop into your children, providing you with a menu. One has a heightened risk for schizophrenia but a very low risk for cancer; another has relatively low risks for these diseases but a three-fold increased risk for Alzheimer’s disease; and a third has roughly average risks for all of these diseases. Oh, and the first two are boys, while the third is a girl.