“Harry Potter author JK Rowling earned more than any other celebrity, according to the annual Celebrity 100 list, taking home $300m (£150m) last year. Since Rowling’s first story about the boy wizard arrived in bookstores in 1997, 375m copies of her books have been sold worldwide. The final instalment, Harry Potter and the Deathly Hallows, has sold 44m since it came out last July.”