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A comment on NASA engineer's 'helical engine' may violate the laws of physics. Parent comment

Re:NASA engineer's 'helical engine' may violate the laws of ... by knzhou on Tuesday October 15, 2019 @03:12AM (#21256214)
In a swing, the back-and-forth linear momentum comes from the tension in the wires, while the energy comes from your legs. No conservation laws are broken.
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