Clicks for doughnuts

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Reference S.R. Waitukaitis, Clicks for doughnuts, Nature Phys. 14, 777-778 (2018)
Group Mechanical Metamaterials

The ideas of topology are breaking ground in origami-based metamaterials. Experiments now show that certain
shapes — doughnuts included — exhibit topological bistability, and can be made to click between different
topologically stable states.