Photons are usually thought of as massless particles, but a recent discovery by Harvard and MIT professors forces physicists to rethink that assumption. By pumping atoms into a supercooled vacuum chamber, the project created a non-linear quantum medium in which photons will actually bind to each other, creating a new form of photon-based matter that, as it happens, looks an awful lot like the business end of a light saber.
via The Verge - All Posts http://www.theverge.com/2013/9/26/4773354/scientists-create-light-saber-material-with-photon-binding-technique
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