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Published on Monday, 05 May 2008 19:00 | | 
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The Holy Grail of physics is the attempt to reconcile quantum mechanics and relativity. Are we getting there?
It seems like the most obvious physical fact: the universe has four dimensions - three spanning space and one ticking away time. But the ultimate theory of gravity should explain why the universe is four-dimensional and how those dimensions arose, say researchers trying to unify the theories of quantum mechanics and relativity.
Now, recently published calculations show that when all possible microscopic contortions of space-time are added together, a large-scale four-dimensional universe can emerge.