It is conjectured that there might exist a law of nature capable of spontaneously producing universes, including our known universe. It arises out of string theory – a theory based on the idea that the fundamental building blocks out of which everything is made consist of tiny vibrating strings. It is expected that the various universes spawned by M-theory would have different laws of nature and different values for the physical constants. There is as yet no evidence for this theory, and it has yet to be formulated.
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