**Physicists who have been roaming the “landscape” of string theory—the space of zillions and zillions of mathematical solutions of the theory, where each solution provides the kinds of equations physicists need to describe reality—have stumbled upon a subset of such equations that have the same set of matter particles as exists in our universe.**

**But this is no small subset: there are at least a quadrillion such solutions, making it the largest such set ever found in string theory.**

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