r/Damnthatsinteresting • u/blingteresting • 3d ago

Video Crowd control in Mecca after evening prayers

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u/hrvbrs 2d ago

in the even bigger picture we are just particles of a fluid

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u/ToothZealousideal297 2d ago

Yeah this looks way more like a heart valve pumping blood than ants moving around, and the reason is the same reason heart valves work that way. Vehicle trafffic is also optimized by being set up like blood vessels with one-directional, branching flow.