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and things like that. It's a it's a good idea to have. It takes you a lot of effort and a lot of
mathematical work to figure it out. So 10 years later in 1915, Einstein finally completes what we call the general theory of relativity. In the general theory of relativity says spaceacetime
is a four-dimensional thing. That four-dimensional thing has a geometry. It's pushed around by matter and energy. And we experience the curvature of spacetime as the force of gravity. When Einstein
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