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Are all the (measurable) dimensionless parameters that characterize the physical universe calculable in principle or are some merely determined by historical or quantum mechanical accident and incalculable?

— David Gross

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We now know that string theory and quantum field theory can often be different ways of looking at exactly the same phenomena.

Physics is always a gamble; it is a game of exploration. That’s the fun of it. We never know for sure what will happen. Sometimes, we theorists can anticipate, but nature is the final judge.

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Quote text and notes from Wikiquote: David Gross (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.