Help me A spinning blue plastic object made me sleepless.

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Help me!!A spinning blue plastic object made me sleepless.

I've seen the mit online vedio course Physics I: Classical Mechanics Lecture 21 Torques, Oscillating Bodies,near the end 44:19.There is a spinning blue plastic object,the teacher spun it, it revolved then it stoped,then it revolved reversely without any other force!
link:http://ocw.mit.edu/OcwWeb/Physics/8-01Physics-IFall1999/VideoLectures/detail/embed21.htm [Broken]
WHY???
 
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  • #2
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That is weird.
 

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