Kinetic Light Newton's Cradle from ThinkGeek
http://www.thinkgeek.com/16a1?cpg=yt
-A futuristic take on this classic desk accessory
-Designed and manufactured by ThinkGeek
-Bright, multicolor LEDs in each sphere
-See the laws of conservation of mass and energy expressed in color!
-Programmed with three lighting modes - flash, fade, color cycle
-Materials: Plastic, wire, LEDs, frosted glass
-Batteries: 6 1.5V AA alkaline batteries (not included)
-Some assembly required (no tools - just popping the rails in place)
-Dimensions: 7" wide x 6" deep x 7 3/4" tall
-Weight: 1 lb. (without batteries)
-Ages 14+
Music by The Parents "The Rarified Air of Products"
http://theparents.org/
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