There is a saying in medicine about learning surgical procedures that can be traced back to William Halsted, a surgical pioneer in the early twentieth century: “See one, do one, teach one.” The idea is that all surgical trainees need in order to be able to carry out a new surgery is to see it done once and, after that, they can figure out how to do it by themselves on succeeding patients. It is the ultimate profession of faith in knowledge versus skill.
