Newtonâ€™s Cradle is a timeless, classic desktop novelty that blends science and art with a dash of fun. Also kâ€Balance Ballsâ€, â€œNewtonâ€™s Pendulumâ€ and â€œNewtonâ€™s Ballsâ€, this executive office toy demonstrates the law of conservation of momentum. Lift one steel ball and allow to fall back at one end, the ball at the opposite end will swing out the same distance.Using Newtonâ€™s third law has never been this much fun! What happens when you swing two? Or three? Newtonâ€™s Cradle was invented in 1967 by English actor Simon Prebble and named in honor of scientist and mathematician Isaac Newton because it employs Newtonâ€™s Laws. Newtonâ€™s Cradle is a clever device that not only demonstrates a pendulum, but also shows the Laws of Conservation of Momentum and Energy.