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Original Hoberman Sphere - Rainbow
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Rattleback® $3.10

The Rattleback® (aka a celt) shows how the rotational energy and momentum carried by an object can be made up of different, independent parts. As friction transfers the energy out of one of its principal rotations, the energy and momentum now in a different rotation takes over in unexpected ways!

Click here to see the Rattleback® in action (file size = 0.185 MB).

Our Rattleback is 3.75" (9.5 cm) in length.

WARNING! This product presents a potential choking hazard. As such, it is not suitable for children under 3 years of age.

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