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1 " When our theories continually move us into more and more complicated explanations then, it is certain that we are moving in the wrong direction. "
2 " We can measure the fine structure constant with very great precision, but so far none of our theories has provided an explanation of its measured value. One of the aims of superstring theory is to predict this quantity precisely. Any theory that could do that would be taken very seriously indeed as a potential 'Theory of Everything'. "
― John D. Barrow , Impossibility: The Limits of Science and the Science of Limits
3 " In chemistry, our theories are crutches; to show that they are valid, they must be used to walk... A theory established with the help of twenty facts must explain thirty, and lead to the discovery of ten more. "
― Jean-Baptiste Dumas
