Take a glass that is partially filled with water and drop a cork into it. The cork won't float in the center, but keeps drifting to one side and attaching itself to the side of the glass.

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      \_______/

Without swirling the water, how can you make the cork float in the center?

the fact that the cork will tend to move to the sides of the glass is also due in part to the shape of the glass itself. Perhaps disturbing the water somehow maybe by mixing and causing a turbulent flow would attract the cork to the center.

Posted by alex on 2008-07-21 17:55:29