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Constructing Spacetime--No Strings Attached

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Science  08 Nov 2002:
Vol. 298, Issue 5596, pp. 1166-1167
DOI: 10.1126/science.298.5596.1166

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Move over, string theory. In the ongoing quest to meld quantum mechanics and gravity, an alternative theory--loop quantum gravity--aims to steal the stage. Whereas string theory begins by assuming how spacetime stretches and twists, loop quantum gravity builds the "geometry of spacetime" from scratch, a crucial feature of any fundamental theory of quantum gravity.