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Extreme Yo-Yoing 156

Roland Piquepaille writes "Unless you're a dedicated yo-yo fan and a serious competitor, I doubt that you'll hand over $400 for a yo-yo. Even if it's a state-of-the-art hogh-tech yoyo made with a forged-magnesium-alloy and coming with the latest in axle technology. With this one, you can use the freehand style, meaning that your hand is not connected to the yo-yo, but is replaced by a small counterweight. In 'Reinventing the Yo-Yo,' Science News Online says 'its balance is ensured with precision tooling to micrometer tolerances by a computer-controlled lathe.' This long article doesn't solely focus on this luxury item. Instead, it looks at the history and the physics of the yo-yo, and includes many references. A good read for a weekend! This overview contains other details and extra references about the Freehand yo-yo."
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Extreme Yo-Yoing

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I have never seen anything fill up a vacuum so fast and still suck. -- Rob Pike, on X.