For most of 1800s, surgery was disgusting, filthy, and unsafe. Hospitals were places people desperately tried to avoid, and operations didn’t always result in a clean bill of health. You might even get your testicles accidentally sawed off during a leg amputation. But this all changed with Joseph Lister, who transformed the way that doctors approach surgeries. We talked to Lindsey Fitzharris, author of “The Butchering Art: Joseph Lister's Quest to Transform the Grisly World of Victorian Medicine” about how this shift happened.