A Brief History of Time: From the Big Bang to Black Holes

Just as an infinite tower of tortoises supporting the flat earth is such a picture, so is the theory of superstrings. Both are theories of the universe, though the latter is much more mathematical and precise than the former. Both theories lack observational evidence: no one has ever seen a giant tortoise with the earth on its back, but then, no one has seen a superstring either.

Stephen Hawking, A Brief History of Time, 1988.

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© Lau Tiam Kok