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Why do so many animals have #eyelashes? Yes, they help keep things out of one’s eyes. However, the authors of this work measured the eyelashes of 22 different #mammalian species, and performed painstaking experiments in a #windtunnel which suggest that eyelash length is optimized, relative to eye size, to divert airflow away from the eye. Not only does this “eyelash length reduces both deposition of airborne particles and evaporation of the tear film by a factor of two.” #science #ethology #jrsocinterface http://dx.doi.org/10.1098/rsif.2014.1294

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