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That's why it's a problem. [For more on the results of experiments at particle accelerators, see Smashing Pictures.] NOVA: What would string theory need to do to make a believer out of you?

String theory suggests that the most fundamental building blocks of the universe are not particles like electrons or quarks, ...

String theory is perhaps the most high-profile candidate for what physicists call a theory of everything – a single mathematical framework capable of describing the entirety of the known universe.