The notion that water behaves differently in northern and southern hemisphere basins is a nice little earner for smart operators living on the equator. In reality, the direction in which the water goes down the plughole is determined by several factors, such as the shape of the basin, and the way the water is moving before the plug is removed, etc. The position of the equator has no effect at all. There are manufacturers in equatorial countries who make basins in 3 shapes, one for north of the equator, one for south and one for right on the equator. The aforementioned smart operators buy these basins and set them up at appropriate places, and charge gullible tourists to watch the water going down the 3 plugholes in what they imagine to be a geographically-determined way.


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