A "Rattleback" undergoes a spin reversal that, at first, appears to violate conservation of angular momentumpic.twitter.com/cU2TMaW3Gr
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If it did that floating in free space I'd be concerned about conservation of angular momentum.
For sure, but the motion definitely made me double take after trying to work in out for 30 mins i felt like I was either being a dunce or it was non-trivial, per the usual for me
![June “Wakalix”, [null]](https://pbs.twimg.com/profile_images/1187814014992076800/5SLXiLlV_normal.jpg)
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That’s when I consulted the almighty ArXiv
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