What else did we leave on the moon? Smarter Every Day explains: http://bit.ly/JunkOnTheMoon Play with a corner reflector: http://labs.minutelabs.io/Optics/corner-reflector/ US Space and Rocket Center: http://www.spacecamp.com/museumHome MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Music by Nathaniel Schroeder http://www.soundcloud.com/drschroeder Thanks to Nima Doroud for contributions and to Perimeter Institute for support. http://www.perimeterinstitute.ca/ Created by Henry Reich