Everyone needs an obscure useless skill. ‐ @Noahpinion
Mine is identifying the topology of time travel stories.
Click here if you know what topology is and just want to get to the time travel stuff
a brief introduction to topology The original study of shapes was geometry, popularized by a Greek mathematician named Euclid. Starting about 2000 years after that, a Swiss mathematician named Euler (pronounced “Oiler”) accidentally inventented topology while trying to solve the Seven Bridges of Königsberg problem.