The FINANCIAL — Wondering is a series of random questions answered by Harvard experts. For the second installment, we asked David Silbersweig — Stanley Cobb Professor of Psychiatry at the Medical School, co-director of the Center for the Neurosciences at Brigham and Women’s Hospital, and co-author of a 2018 paper on the neurobiological effects of music — why certain songs lodge in our heads. According to University of Harvard, some surveys have found that 90 percent of people experience this phenomenon, and for about a third of them, it’s annoying. It’s known as an earworm, and it comes from theThe FINANCIAL -- Wondering is a series of random questions answered by Harvard experts. For the second installment, we asked David Silbersweig — Stanley Cobb Professor of Psychiatry at the Medical School, co-director of the Center for the Neurosciences at Brigham and Women’s Hospital, and co-author of a 2018 paper on the neurobiological effects of ► The FINANCIAL Education