Developmental biology has shown that embryo modification cannot proceed safely. This is clear from experiments on animal embryos, where altered genes are often seen to behave in unpredicted ways, and in human population studies, where genetic mutations that had been found to cause disease in some individuals or groups turned out to be perfectly harmless in others. Any attempt to edit even a single base-pair in an embryo will be uncontrolled human experimentation of the kind prohibited by international law. This 12-step program to "ethical" human gene alteration is a time-buying maneuver that may soften up the public with assertions of virtuous conduct, but is just a way-station to techno-eugenics. My colleague Tina Stevens and I have written about how we arrived at this climate of acceptance of humans as biologically perfectable products in "Biotech Juggernaut: Hope, Hype, and Hidden Agendas of Entrepreneurial BioScience": https://www.amazon.com/Bi...