Elmo and a Justin Bieber look-alike sing "Measure, Yeah, Measure," a spoof of Bieber's hit "Never Say Never." Sesame Street are celebrating the premiere of our new science-filled season on Monday September 26th on PBS with this, our 1,000th video on YouTube! If you're watching videos with your preschooler and would like to do so in a safe, child-friendly environment, please join us at http://www.sesamestreet.org Sesame Street is a production of Sesame Workshop, a nonprofit educational