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The American Association of Physics Teachers called the original Levitron "the best new science toy in a generation." This, the latest version, is so much more than a spinning top. As it spins (using only your finger-power, no batteries are required), it levitates above a magnetic pad, high enough for you to pass your hand under it, and is great fun for kids and adults alike.

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Levitron Omega Levitating Spinning Top [thegadgetbox]