Einstein Theory of Relativity (Explained) -1923

Einstein Theory of Relativity (Explained) -1923 by Business & Technology Academy
Einsteins Theory of Relativity is a subject requiring a life-time to master. It obviously cannot be demonstrated in a few minutes. This is therefore an attempt to explain only some of the more popular ideas. This silent movie is about the theory but the explanations almost make it easy for us to understand.. but not quite. This is a very complicated subject and controversial. But this is a good try circa 1923. Some of this has since been disproved with the discovery of dark matter.
via YouTube https://youtu.be/a_9AhO3eF-g