I recently read The Search: Finding Meaningful Work in a Post-Career World by Bruce Feiler. Among hundreds of interviews with people who had taken unconventional paths to career fulfillment, the author found that one of the most direct ways of determining someone's passion as an adult was: What was your toothache as a child? The term is inspired by Hans Christian Andersen's story Aunty Toothache, where a boy suffers an excruciating toothache at the cost of his talent for writing great poetry....