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MACHINES: HOW THEY WORK Thursdays 10/9c on Science Ten steel balls roll between the inner and outer rings within a yoyo's shell. They work together to reduce friction, allowing the yoyo to keep spinning at the bottom of the string for over 10 minutes. More Machines! http://www.sciencechannel.com... More


Added Apr 8, 2016  

Channel Science & Technology

Duration 2:11   |   views 1465729


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