I’ve heard that water going down a drain spins one way in the Northern Hemisphere and the opposite way in the Southern Hemisphere. But when I pull the plug on standing water in our kitchen sink, sometimes it spins clockwise and sometimes the other way. Can you explain? The popular notion is wrong. Some people think that planetary spin influences the way water spirals down a drain, but that effect is utterly inconsequential on such a small scale. Water will drain one way or another anywhere in the world for a great many other reasons, such as the shape of the sink, the placement of the drain and even which way or how hard someone pulls the plug.
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