Had a bizarre dream last night. I dreamed that action doesn't quite equal reaction. They were the same out to several decimal places, but if you went far enough, they didn't quite match. Further. The difference changed when the axis of the action reaction pair changed. I think it had something to do with either QM effects, or curvature of spacetime. Long story short was that with enough mass and a high enough cycle rate over a sufficiently long path, you got a reaction less space drive which is not quite the holy grail of space flight. (FTL is). But I'd take it.
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