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Closed quasigeodesics on the dodecahedron (quantamagazine.org/mathematici), paths that start at a vertex and go straight across each edge until coming back to the same vertex from the other side. Original paper: arxiv.org/abs/1811.04131, doi.org/10.1080/10586458.2020.

I saw this on Numberphile a few months back (video linked in article) but now it's on _Quanta_.

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