Book excerpt: Wu Zetian was an intelligent and ambitious woman. She married Emperor Gaizong of the Tang Dynasty and became Empress. But Wu wasn’t satisfied. She wanted to rule in her own right. She was determined to become Emperor of China and killed anyone who stood in her way – even her own children. Find out more about this legendary ruler in this 15-minute children's biography. Ages 10 and up. Reading Level: 6.8 Learning Island believes in the value of children practicing reading for 15 minutes every day. Our 15-Minute Books give children lots of fun, exciting choices to read, from classic stories, to mysteries, to books of knowledge. Many books are appropriate for hi-lo readers. Open the world of reading to a child by having them read for 15 minutes a day.