The second of the reasons why we expect successful scientific theories to be beautiful is simply that scientists tend to choose problems that are likely to have beautiful solutions. The same may even apply to our friend the racehorse trainer. He trains horses to win races; he has learned to recognize which horses are likely to win and he calls these horses beautiful; but, if you take him aside and promise not to repeat what he says, he may confess to you that the reason he went into the business of training horses to win races in the first place was because the horses that he trains are such
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