In his latest book, the paleoanthropologist Ludovic Slimak recounts how, as a young man, he spent his time observing people as he played the bagpipes in a kilt on the dirty streets of Marseille. Driven by an unconscious impulse, he had decided to master the instrument, and he succeeded, even leading a famous band in France. Then his first child was born, he found himself traveling from gig to gig, and eventually, he gave it up. But he was able to earn his PhD with the money he made from music.