String theory hasn't been yet proven by science but it is potentially scientific and not merely wishful thinking because it is open to being tested by scientists who have proposed a number of experiments to demonstrate if it is true or not.
Feynman's definition of science is that the way to look for a new law you take a guess first, then you compute the consequences of the guess to see what it implies and if it's right. Then you compare those computation results to nature, compared directly with observation to see if it works. He believes the key of science is: If it disagrees with the experiment then it's wrong.
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