Sue is traveling by ship from south of the equator to the north. She has a nice little cabin with a bathroom, but no window. Sue has neither a compass nor any other instruments. Just the general luggage one brings on board a long cruise. Yet, without leaving her room or talking with anyone, Sue will be able to tell when the ship has crossed the equator. How?
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When she flushes the toilet in her bathroom, the water will rotate the other direction.
You’re right, Paul.
As they cross the equator the water will begin to drain in the opposite direction.
You’re today’s winner!
Although technically it doesn’t
http://en.wikipedia.org/wiki/Flush_toilet#Swirl_direction
Yes, we capitulate to Geoff. Theoretically, the influence of changing hemispheres on the flow of water down a basin is too minute to affect it one way or another. The RiddleDude concedes this point. It is such a widely-believed myth that we think the riddle still has merit. Hope you did to.