Pope Benedict XVI offered a rare glimpse into his past Saturday and gave a small lesson in Catholicism to children who attended his first youth rally at St. Peter's Square; an event that was reminiscent of the gatherings inspired by Pope John Paul II. Benedict recalled the sunny, "beautiful Sunday" in 1939 that he made his First Communion at the age of 9, telling an estimated 150,000 children and their parents he had begun a "lifelong friendship with Jesus" that he hoped the children would also enjoy. "So I went forward in my life, and thanks to God, the Lord...