TED: Making sense of string theory | Brian Greene

The video explores the concept of extra dimensions in the universe, starting with Theodor Kaluza's proposal and its impact on physics. It discusses Einstein's theory of gravity, Kaluza's attempt to unify gravity and electromagnetism, and Oskar Klein's idea of curled-up dimensions. The video introduces superstring theory, which suggests the universe has more dimensions than we perceive. It concludes with potential experiments at CERN to test for these extra dimensions.

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