Frank Wilczek, Theoretical Physicist and Nobel Laureate, MIT: "Ninety-five percent of the mass of matter as we know it comes from energy."

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Lene Hau, Experimental Physicist, Harvard University: "You can get access to parts of nature you have never been able to get access to before."

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Michio Kaku, Theoretical Physicist, City University of New York: "E = mc2 is the secret of the stars."

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Neil deGrasse Tyson, Astrophysicist, American Museum of Natural History: "It's something that doesn't happen in your kitchen or in everyday life."

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Tim Halpin-Healy, Theoretical Physicist, Barnard College, Columbia University: "Moving clocks run slow, moving meter sticks are shortened -- how does that happen?"

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Alan Guth, Theoretical Physicist, MIT: "It's easiest to explain by how things looked from the point of view of Newton."

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Nima Arkani-Hamed, Theoretical Physicist, Harvard University: "Things that seem incredibly different can really be manifestations of the same underlying phenomena."

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Sheldon Glashow, Theoretical Physicist and Nobel Laureate, Boston University: "When an object emits light, say, a flashlight, it gets lighter."

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Janet Conrad, Experimental Physicist, Columbia University: "For me there's a lot more to the equation than E = mc2."

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Brian Greene, Theoretical Physicist, Columbia University: "It certainly is not an equation that reveals all its subtlety in the few symbols that it takes to write down."

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