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Originally Posted by Martian
Right on the second one. Despite what Lisa Simpson says, the coriolis effect applies to air masses, not water in a toilet or sink.
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Actually, the water in toilet bowls down here in Australia doesn't rotate either way on its way down. When the cistern empties, water flows from the back of the bowl under the rim, around and down both sides and where the two streams meet at the front it fountains back into the middle.
The coriolis effect applies to all bodies of fluid, though the results are small in smaller bodies.