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Continue to ChatMach-5, the speed at which stress can't keep up, is simply forward motion. But it has to be self- propelled. Note that people in cars are still stressed. - Jef Mallett from https://whatsmyquote.com/quote/mach-5-the-speed-at-which-stress-can-t-keep-up-is-simply-forward-motion-but-it-has-to-be-self-propelled-note