Watch as this crazy spinning top starts levitating
The Levitron: spin stabilized magnetic levitation- will fly for about 3 minutes or more per launch. The spin rate of the magnetic top must be just right for flight, not too fast or too slow. Also the weight of the top must be adjusted to within 1 gram to achieve equilibrium between the pull of gravity and the magnetic repulsion from the large donut shaped magnet in the wood base. Probably my favorite physics toy of all time.
Find out more: http://physicstoys.blogspot.com/p/physics-toy-store.html