In 1841, a quiet, curious boy who stuttered when nervous committed to becoming a surgeon—a profession then more feared than respected. Through study, persistence, and careful research, Joseph Lister proved that unsanitary conditions contribute to infections. Despite others scoffing at his ideas, Lister slowly changed the way all surgeons work, saving countless lives. Sibert Honor-winner Lori Alexander’s accessible and lively biography of Lister contains fun—and sometimes gory—facts about the history of science and engaging illustrations by Daniel Duncan.