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An old riddle runs as follows. An explorer walks one mile due south, turns and walks one mile due east, turns again and walks one mile due north. He finds himself back where he started. He shoots a bear. What color is the bear?

How many spots on the globe are there from which one could walk a mile south, a mile east, a mile north and find himself back at his original position?

Carl Lee
Wed Apr 21 08:26:07 EDT 1999