I had no idea what this photo was by looking the thumbnail
Looking up Google I have just found out this:
The notion that water behaves differently in northern and southern hemisphere basins is not true. 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.
Now you know it - and all because of me looking at your photo - thanks Doug...
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