When "Sesame Street" producers realized that their preschool audience was growing, they introduced an orange mini-monster meant to connect with younger kids. But the puppet didn't quite strike a chord and was put into storage. Several years later a young puppeteer named Kevin Clash resurrected the character of Elmo, and this time the puppet was bright red with a melodic falsetto voice that would go on to capture the hearts and imaginations of scores of children throughout the world. Thought you knew everything there was to know about the Great Red One? Test your Elmo smarts and find out.