The first steps to answering these questions were taken almost a century ago, at the height of the American Jazz Age. At the time, the new-fangled IQ test was gaining traction, after proving itself in World War One recruitment centres, and in 1926, psychologist Lewis Terman decided to use it to identify and study a group of gifted children. Combing California’s schools for the creme de la creme, he selected 1,500 pupils with an IQ of 140 or more – 80 of whom had IQs above 170. Together, they became known as the “Termites”, and the highs and lows of their lives are still being studied to this day.