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2) (A psychology professor [...who] was doing Alzheimer research on rats
using the Morris water maze
http://www.watermaze.org/
asked me about this one.) How would you go about canceling out the
earth's magnetic field in the region of the surface of the water in a
1-meter deep pool (he used a deeper pool than the one depicted at
watermaze.org) of water having a circular surface of diameter 1.8
meters?