Moondrop Set

Moondrop fidget toys make clever use of Lenz’s Law to replicate the differing gravities of Earth, the Moon, and Mars. Small rare-earth magnets within each shaft create a current in the falling aluminum or copper piece which forms a magnetic field in the opposite direction, slowing the fall of the piece to replicate the different gravity. They can also be combined for just general fidgeting.

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Cost

$0-$24

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