Theory of Relativity made easy

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Theory of Relativity made easy

Clip from Who's Afraid Of A Big Black Hole?  |  BBC Knowledge  |  October 1, 2010

Space, time, gravity - Einstein's Theory of Relativity was the first to link them all. But what is his theory about?

Space, time, gravity - Einstein's Theory of Relativity was the first to link them all. But what is his theory about?

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