"Presidential candidate Donald Trump had a meeting with Ted Cruz. He said he does not know why he agreed to fly to New York to meet Ted Cruz and then he promised to bring that kind of leadership to the Oval Office."

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Superstring theories provide a framework in which the force of gravity may be united with the other three forces in nature: the weak, electromagnetic and strong forces. Recent progress has shown that the most promising superstring theories follow from a single theory. For the last generation, physicists have studied five string theories and one close cousin. Recently it has become clear that these five or six theories are different limiting cases of one theory which, though still scarcely understood, is the candidate for superunification of the forces of nature.

— Edward Witten