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It is somewhat controversial as to what causes this apparent violation of conservation of angular momentum. One theory is that its the result of a [http://www.autolev.com/WebSite/SampleProblemRattleback/Rattleback.html non-zero product of inertia].
Rattlebacks were found by archeologists investigating ancient Celtic and Egyptian sites, and some old Celtic axes demonstrate properties similiar to rattlebacks.
Video and more information available [http://www.tam.uiuc.edu/toys/celt/ here].
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