It's Elmo's world, and we're all just living in it. Sesame Street, the show that paved the way for preschool-age television programming, has its own YouTube channel. All the characters we know and love make appearances in the various entertaining and educational videos. Murray Monster has his own series of videos that shows kids participating in fun science experiments, and Elmo and Cookie Monster star in "Monster Fixers," a series about fixing everything from Little Bo-Peep's broken fence to Humpty Dumpty's broken shell.