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Submission + - Octopus Inspires Silent Propulsion System for Boats and Subs (gizmag.com)

Zothecula writes: Octopi and squid swim not by swishing a tail, but by expelling a jet of water. This allows them to move very quickly and quietly. Scientists from Germany’s Fraunhofer Institute for Manufacturing Engineering and Automation have now copied this system, in a propulsion system that could ultimately find use in boats, recreational watercraft, or submarines.
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Octopus Inspires Silent Propulsion System for Boats and Subs

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"Irrigation of the land with sewater desalinated by fusion power is ancient. It's called 'rain'." -- Michael McClary, in alt.fusion

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