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https://euzicasa.wordpress.com/2019/09/08/what-if-we-would-measure-time-from-5-to-5-seconds-at-a-time-and-not-every-second-watch-jumping-jack-flash-on-youtube/
What if we would measure time from 5 to 5 seconds at a time, and not every second? Watch "Jumping-Jack....Flash" on YouTube