Visionaries, dreamers, and autocrats have long dreamt of reshaping humanity to their preferred model. In the last century, eugenics was enthusiastically embraced among Anglo-Saxon elites, then by Communist Russia as a means of creating a hyper-selfless Homo Sovieticus, and, most infamously, Nazi Germany’s drive to create a “master race” via racial-hygiene laws and the extermination of people with disabilities and other “lives unworthy of life.”