The Tri-State Tornado of 1925 was the deadliest tornado strike in American history, tearing through three states and killing 700 people. Almost a century later, the Joplin Tornado was a mile-wide monster that nearly destroyed the heart of a vibrant city. The author of the "New York Times" best-selling "I Survived" series now brings you the vivid and true stories of two young people who survived these terrifying twisters, along with fascinating facts about tornadoes and profiles of the well-respected scientists and storm chasers who study them.