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Bioinspiration

The single biggest key to sound reduction, the team found, was the synchronization of the school’s tail flapping—or actually the lack thereof. If fish moved in unison, flapping their tail fins at the same time, the sound added up and there was no reduction in total sound. But if they alternated tail flaps, the fish canceled out each other’s sound, the researchers found.

What’s quieter than a fish? A school of them

Categories Life & Non-humans, Physics & Mathematics

The micro-fringes on owl wings effectively suppress the noise while maintaining the aerodynamic performance of the wings comparable to that of a wing without the fringes.

Uncovering the secrets behind the silent flight of owls

Categories Life & Non-humans, Physics & Mathematics

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