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String Theory in its most basic sense asserts that, if we could zoom in and see the smallest building blocks of matter - if we soared past the atom and protons and quarks, and we got all the way down to the smallest of the small - we would find “strings.”  This is the fundamental idea of superstring theory (“string theory” for short).  It claims that the electrons and quarks that make up all the matter in our universe are not zero-dimensional objects, but one-dimensional "strings."  Ultimately, the theory goes on to state that these "strings" oscillate, giving the aforementioned particles their charge, mass, spin, and flavor.  Thus, "strings" are everything.   From a TED talk given in February 2005.   For more info, watch this interview from 2015: String Theory, Eleven Dimensions And Parallel Universes Explained   Update (Dec 2017): As yet, efforts by the Large Hadron Collider at CERN in Switzerland to confirm the existence of these extra dimensions have been inconclusive. 

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