JK Rowling has written Quidditch Through the Ages, Fantastic Beasts and Where to Find Them, and The Tales of Beedle the Bard. She is also planning on writing a Harry Potter Encyclopedia, which will contain the answers to many of the fans' questions. Rowling has also released some additional information on her official website (jkrowling.com) and on Pottermore. She has even written a Harry Potter Prequel, an 800-word story about James Potter I and Sirius Black III riding Sirius's motorcycle in 1977, three years before Harry J Potter's birth, and meeting two Muggle policemen. Unfortunately, so far, Rowling has said that it is unlikely for her to write a series about Harry's children's years at Hogwarts School of Witchcraft and Wizardry.