Einstein's Theory of Special Relativity

In the field of particle physics, string theory brings together quantum mechanics and Albert Einstein’s general theory of relativity. String theory provides a theoretical framework in which all particles, from photons to quarks, are one-dimensional strings as opposed to zero-dimensional points. If a version of string theory were found that held up in all contexts, it would serve as a single mathematical model for describing the nature of the universe—a “theory of everything” that would replace t