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How yo-yo is made - making, history, used, parts, dimensions, steps, product, machine, History
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How do yo-yos work? The science and physics of the yo-yo toy
How do yo-yos work? | Who invented yo-yos?
newtonian mechanics - Why does a Yo-Yo sleep, and then awaken? - Physics Stack Exchange
Nagraj Gollapudi on how the yo-yo test became a selection standard for international teams | ESPNcricinfo
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Whip Yo-Yo | Hobby Lobby | 435396
