You start at some point on the globe, walk 50km to the south, 50km to the east and 50km to the north, and end up in the same point. How many such points are there, and where are they?
(This question is named polar bears for it's naive version which only considers the north pole, then the walker is said to be a bear, and the childish question asks for its color, which is white. In our case, we look for a less trivial answer than just north pole)