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Rattleback

A rattleback is a mysterious spinning toy that can spontaneously change its direction of spin. This example of one is made from the bowl of a cheap plastic spoon, cut in half (thanks, Geoff!). Without the paperclips, it has a single preferred spin direction: if started spinning in the other direction, it will wobble and then start spinning in the preferred direction.

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Submitted: 06/01/2012
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