Vast beds of 'hair' coat many living systems, and usually exhibit shear-thinning behaviour — their flow resistance lessens with speed. But with geometric tweaks, such beds can also show shear-thickening and asymmetric ratchet-like behaviour.
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Luhar, M. A remedy for thinning hair. Nature Phys 13, 927–928 (2017). https://doi.org/10.1038/nphys4247
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DOI: https://doi.org/10.1038/nphys4247