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Wanna see an amazing amplification of kinetic energy? Here's how it works...several balls of different sizes are threaded on a plastic rod. When the apparatus is dropped straight downward onto a hard surface, the energy of the large ball at the bottom is transferred through a series to the smaller ball on top. The result: it flies up at great speed reaching heights of over 25 feet! Leads into an interesting discussion of what's happened due to the Law of Conservation of Energy. Includes a pair of stylish safety glasses. For ages 10 and up with adult supervision.