Sound on a Light Beam, Optical Illusion, Wired Hockey Players, Balloon and Marshmallow in Vacuum, Merry-Go-Round Water Drain, Hole in Bottle, Diamond Find, Aluminum Foil Cleans Silver. Mr. Wizard tells Stacey she is going to send sound over a light beam! He shows her a record player with sound coming from the speaker. The sound is recorded on the grooves.