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Here's how a high school teacher's "Mystery Box" works

Mystery box revealed- Wheel and axle // Homemade Science with Bruce Yeany

High school teacher Bruce Yeany makes “mystery boxes” and challenges his students to figure out how they work. The one in this video hangs from the ceiling by a string. Another string protrudes from the bottom of the box. If you pull on the bottom string, the box rises. In the video you’ll see how it works.

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