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The … results have given physicists confidence that we understand the origin of the universe to within a fraction of a second after the Big Bang. However, we are still left with the embarrassing questions of what preceded the Big Bang and why it occurred.
— Michio Kaku (1994)
Hyperspace: A Scientific Odyssey Through Parallel Universes, Time Warps, and the 10th Dimension
Oxford University Press, p. 201
Oxford University Press, p. 201