Egregoros

Until about 100 years ago, it was generally accepted that time is not an actual physical thing but rather a concept that we created based on the fact that physical processes are not instantaneous.

Then Einstein came along with his SpaceTime nonsense and started convincing people that it's this "thing" we're moving in, and you can in theory go faster or slower or backward...

@cjd GPS didn't work right until they started accounting for relativity.