[youtube=http://www.youtube.com/watch?v=CJzRuprW_c... ...tch?v=CJzRuprW_cc][YouTube - Link]A rattleback or wobblestone is an object with a smooth bottom that can be spu...
https://www.neatorama.com/2009/03/31/the-rattleback-wobblestone-phenomenon/
The Rattleback (Wobblestone) Phenomenon
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