The example of surgery is instructive, because the costs of failure are so stark. The “July effect,” so-called for the month when U.S. medical residents begin their work, has an even bleaker nickname in the United Kingdom: the killing season. That irreverent moniker reminds us that there is no “failure free” option for teaching human beings new skills, even in life-and-death disciplines. Every summer, the experts grimace and hand over the knife to those who have never held it before. Whatever our line of work, we can learn to do the same for those who need the chance to learn.