In a hypertorus model of the Universe, motion in a straight line will return you to your original location. Image credit: ESO and deviantART user InTheStarlightGarden, under a c.c.-by-s.a. 4.0 ...

Have you ever been on a long-haul flight and wondered why your aircraft is taking a curved route instead of flying in a straight line when you look at the inflight map? why do planes fly in a ...