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It is somewhat difficult to mathematically explain the causes of the '''rattlebacks''' strange motion. One explanation is that its the result of a [http://www.autolev.com/WebSite/SampleProblemRattleback/Rattleback.html non-zero product of inertia]. Basically it is the broken symmetry in the object that makes it's motion so strange.
Rattlebacks were found by archeologists investigating ancient Celtic and Egyptian sites, and some old Celtic axes demonstrate properties
Video and more information available [http://www.tam.uiuc.edu/toys/celt/ here].
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