What is Spacetime, Exactly?

Spacetime is the idea that the universe is 4-dimensional, but what exactly is a dimension? Let's get figure it out by making a better spacetime diagram.

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SOURCES

Minkowski Papers:

"The Fundamental Equations for Electromagnetic Processes in Moving Bodies"
(English) https://en.wikisource.org/wiki/Transl...
(German) https://de.wikisource.org/wiki/Die_Gr...

"Space and Time"
(English) https://en.wikisource.org/wiki/Space_...)
(German) https://de.wikisource.org/wiki/Raum_u...)

"The Relativity Principle"
(German PAYWALLED) https://onlinelibrary.wiley.com/doi/1...
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TIME CODES

00:00 Intro
00:22 Modern Relativity
01:15 What is a Dimension?
02:18 Drawing 4 Dimensions
03:10 Spacetime Diagram
04:01 Minkowski vs Einstein
04:31 Spacetime Events
05:56 Cause and Effect (Causality)
07:01 Closing Thoughts
07:47 Featured Comments