There have been many remarkable develop- ments in our understanding of superstring theory in the past few years, a period that has been described as "the second super- string revolution." In particular, what once appeared to be five distinct theories are now recognized to be different manifesta- tions of a single (unique) underlying theory. Some of the evidence for this, based on dualities and the appearance of an eleventh dimension, is presented. Also, a specific proposal for the under- lying theory, called "Matrix Theory," is described. The presen- tation is intended primarily for the benefit of nonexperts.
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