- YouTube: https://www.youtube.com/watch?v=TcOLyqfA5k8
- Invidious: https://inv.nadeko.net/watch?v=TcOLyqfA5k8
BTW I get 3 different titles, depending on where I look the video up:
- I never understood why spacetime needs a minus sign…until now!
- How Einstein’s Professor actually unlocked relativity
- The Idea Einstein thought was stupid
Video description:
Why does the spacetime interval have a minus sign?
The books I mentioned in this video:
Relativity visualised by Lewis Epstein
Spacetime Physics by Edwin Taylor
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