As a young boy, John Lennon loved to cause mischief at school. As a teenager, he failed exams, learned to play guitar, and started a rock band. As an international star, his groundbreaking music, unconventional lifestyle, and protests for peace astounded the world. John found fame as lead singer of the most popular band in history, the Beatles. Between 1963 and 1970, John and his wife, Yoko Ono, were using their fame to promote world peace. Their...