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A fun science demonstration of kinetic energy, low friction and reflective light. I first seen it on the Big Bang Theroy and got one for my grandsons (and me) to mess around with. You can also see it on You Tube.
Verified purchase: Yes | Condition: New
LOVE IT! Can't stop spinning this thing and watching it, timing it, marvelling at it. Everyone I show it to is similarly enchanted. Nice to have the various magnetic attachments, too. Trippy!
Verified purchase: Yes | Condition: New
Wonderful toy! It spins much longer than a coin due to a great heft and the right proportions. The concave mirror stand also prolongs the spin and keeps it on the table. Good for teaching students about potential energy, gyroscopic precession, moment of inertia, etc.
Verified purchase: Yes | Condition: Pre-owned
Amazing how a toy can also teach so much science.
Verified purchase: Yes | Condition: New
This toy is very entertaining. It will spin for several minutes and amaze everyone. The holographic covers create a light show. It seems a bit pricey for being just a metal disk and mirror, but the entertainment value is worth it.
Verified purchase: Yes | Condition: New
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