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A US company is using machine learning to pick through the genetic data of embryos to establish the risk of health conditions. The ethical debate around this sort of pre-screening is hardly new, but it's important to note that Hsu is not genetically altering embryos. The expansion or contraction of human choice is often used as a barometer by which the ethical permissibility of new technologies is judged. This is particularly pertinent in the kind of situation described by Stephen Hsu, where parents might be forced to choose between a healthy embryo and a trait considered less desirable.