Nima Arkani-Hamed - How Can Space and Time be the Same Thing?

What does it mean for space and time to be the same thing? Not related to each other, but literally two descriptions of precisely the same entity called 'spacetime'? One cannot understand existence without understanding spacetime.

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Nima Arkani-Hamed (born 5 April 1972) is a Canadian/American theoretical physicist with interests in high-energy physics, string theory and cosmology. Formerly a professor at Harvard, Arkani-Hamed is now on the faculty at the Institute for Advanced Study at Princeton.

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