Consider the following popular riddle:

“An explorer walks one mile due south,

turns and walks one mile due west, turns again and walks one mile due

north. He finds himself back where he started. He shoots a bear, what

color is the bear?”

The answer found in most puzzle books is “White” since he must have started at the North Pole.

But in fact, he could have started in other place(s). Another possible starting location is 1+1/(2pi) miles north from the south pole. In this solution, he walks 1 mile south to be 1/(2pi) miles north of the south pole, then walks due west in a circle of circumference 1, and then north to his original starting location.

See if you can figure out every possible solution (assuming the Earth is a perfect sphere).

** spoiler alert **

there are an infinite number of solutions. you could start off at 1 + 1/4pi, or 1 + 1/6pi, or 1 + 1/8pi etc miles north of the south pole. Going west would entail making 1 loop of 1 mile, 2 loops of 1/2 miles, or 3 loops of 1/3 mile, etc!

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Actually you can’t start at or near the South pole. There are no bears in Antarctica, so the only solution must be starting at the North pole (where there are polar bears!).

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and i read:

> assuming the Earth is a perfect square

and was like WTF

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