The laws of physics in the offspring might differ slightly, and at random, from the parent - so universes might evolve, suggests Lee Smolin of the Perimeter Institute in Waterloo, Canada.

后代宇宙的物理规律可能会同前一代的宇宙稍有不同，并有随机性——所以说宇宙可能是在不断进化的。

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He differs from Mr Smolin in seeing more merit in theories that are beautiful, whereas Mr Smolin puts more emphasis on experimental tests.

ECONOMIST: Theoretical physics