Darren New wrote:
> You are sitting in a canoe, in a swimming pool, holding a cannon ball in 
> your lap. You throw the cannonball overboard, and it sinks to the 
> bottom. Does the level of water in the pool go up, go down, or stay the 
> same?

The water goes up (then down again) in a mostly parabolic manner since 
the bowling ball would make a large splash :-)

I won't spoil the real answer for anyone still thinking about it, but 
here's another fun physical puzzle that I remember:

If you've been on the beach, you've probably noticed that the sand dries 
out around you foot when you step on it, why is this?  Wouldn't you 
expect a small puddle of water to form around your foot instead?

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