One unforgettable moment of UPenn's visiting weekend for their physics grad program (way back in 2007
): Tom Lubensky (of "Chaikin & Lubensky" fame) pulling a few of these out of a drawer of his fancy department chair desk and getting them spinning one way then the other...https://twitter.com/InertialObservr/status/1182854407588741121 …
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After seeing the absolute delight on his face, I looked up his paper with Tsai, Rodriguez, Ye and Gollub on a "chiral granular gas" that was inspired by these toys: https://ww3.haverford.edu/physics-astro/Gollub/publications/A%20Chiral%20Granular%20Gas%20of%20Rattlebacks.pdf … (more movies here https://ww3.haverford.edu/physics-astro/Gollub/chiral/index.html …)pic.twitter.com/qpPVKlvta9
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A difficult and eye-opening paper: you can model the "hydrodynamics" of just about anything if you list the degrees of freedom and symmetries (or at least Tom can!). Fast-forward to a few years ago and I was fortunate to be around to witness some of the exciting developments...pic.twitter.com/ghhJoDzUyd
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from Vincenzo Vitelli's group on "edge currents" and "odd viscosity" in active chiral systems like these! (movie from tweet above: https://www.pnas.org/content/113/46/12919.short …) (movie in this tweet: https://www.nature.com/articles/s41467-017-01378-7 …) Conclusion: from toys to active fluids, soft matter physics rules the world!pic.twitter.com/61TU2luxS2
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