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So I remember a story with a submarine that was powered off a big flywheel, and every once and a while they'd have to power up the engine to spin the flywheel back up. Lots of other people have ...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:13Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/11420 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/