This is the illuminated Newton's Cradle that uses LEDs to demonstrate Isaac Newton's Third Law of Motion.
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This is the illuminated Newton’s Cradle that uses LEDs to demonstrate Isaac Newton’s Third Law of Motion. An homage to the famous kinetic sculpture, this updated version of the classic desktop accessory has LEDs embedded inside its five globes—causing the spheres to change color when contact is made. Assembly required. Requires six AA batteries. 9 3/4" L x 9" W x 5 3/4" D. (14 oz.)