Quote:
Originally posted by Camron Rust
You got lucky and owe that credit back to the teacher. 
The direction of the swirl is due to the manufacturing geometry of the toilets...not the location of installation.
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Thank you for pointing this out -- I'm amazed at the number of people who think that the change is due to the coriolis effect. The effect, while real, is way too weak to be seen in a toilet or a bathtub, unless the water is very still.
See, for example,
http://www.snopes.com/science/coriolis.htm