one person, lets call him Mr. X, walked south one mile, west one mile, and then back north one mile. he then looked around and noticed he was back where he started. where on the earth is this possible?
(note there is a really obvious answer honestly everyone gets in like 2 minutes, and because its so easy, ill just say it. if you havent figured out the answer when you are reading this, you definetly didnt think about the question. so, easy answer is: mr fubini was on the north pole. if you look at the intersections of the meridians, its kind of obvious.
however, there is another solution to the problem (this is the harder part).
if he wasnt on the north pole, then where was he?