Most of us have seen a Newton’s Cradle in action in a physics class or even at toy stores. It is a device that demonstrates conservation of momentum and energy via a bunch of swinging spheres. The Kinetic Light Newton’s Cradle takes it a step further by introducing multicolor LEDs, so you can kill even more time with your toy.
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Kinetic Light Newton's Cradle from ThinkGeek
Each frosted glass sphere has two LEDs, with lights reacting based on their position. Once you start a kinetic chain reaction with one ball, others will change their color in response. This toy measures 7″ wide, 6″ deep, and 7 3/4″ tall. It weighs 1 lb without batteries. Not the cheapest toy but looks like a lot of fun to play with.
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