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Falling has never looked as cool as when displayed by Euler's Disc.
Named after the famous mathematician Leonard Euler (pronounced oiler), this desk toy is an amazingly fun-to-watch demonstration of several physics concepts.
With a flick of the wrist, the heavy chrome-plated disc call fall for up to two minutes! The exact motion is known as sprolling (a combination of spinning and rolling), and it causes the disc to make circular passes around the center of the base while remaining upright as it slowly falls.
As the disc loses energy, the angle between it and the base diminishes and an interesting whirring sound is created.
A set of magnetized holographic foils can be placed on the top of the disc to create interesting visual effects. Turn out the lights, add a laser pointer, and the ensuing light show is nearly beyond belief.
Don't be shy; smart stuff is fun!
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