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  4. Edward Witten
  5. There was a long history of speculation that in quantum...

There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime to change.

Edward Witten
Change, Long, Might
There was a long history of speculation that in quantum gravity, unlike Einstein's classical theory, it might be possible for the topology of spacetime to change.