Stephen Colgan

“the Riddle: “You’re standing on the surface of the Earth. You walk one mile south, one mile west, and one mile north. You end up exactly where you started. Where are you?” One answer to that is the North Pole, and most of the engineers get it right away. That’s when Musk will follow with “Where else could you be?” The other answer is somewhere close to the South Pole where, if you walk one mile south, the circumference of the Earth becomes one mile. Fewer engineers get this answer, and Musk will happily walk them through that riddle and others and cite any relevant equations during his explanations. He tends to care less about”
― Ashlee Vance, Elon Musk: How the Billionaire CEO of SpaceX and Tesla is Shaping our Future