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Mystery physics: What does the M in M-theory mean?

newscientist.com — (Image: Hal Bergman/Getty Images) Some of the world's greatest physicists couldn't tell you why our leading theory of everything is labelled "M" Is there an answer? I ARRIVED at the Harvard Science Center and made my way to the fifth floor. But when I got there, a flood of students and professors came pouring down the hallway.