Here is another gravity defying toy that shows how magnetic levitation works. The American Scientific Revolution Levitation Demonstrator has 3 parts and can be put together easily. Once you twist the axle with your fingers, this will spin horizontally for up to 20 minutes. No battery is required either.
You may also want to see:
Revolution Levitation Magnetic Desk Toy ☰ Gadgetify
The black and white reflecting strips on the axle are useful for measuring rotation speed using a stroboscope.
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