Here is a cool pendulum that lets you use magnets to get it moving in random ways. ROMP (Chaotic Magnetic Pendulum) comes with tiny magnets you can place all over the base to experiment.
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Chaotic Magnetic Pendulum (ROMP) ☰ Gadgetify
The pendulum moves as it is attracted and repelled by the magnets. You can attach and take it apart in a minute.
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