Word: nonphysicist
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...dogs also yield another key bit of information: they tell theorists how the universe is curved, in the Einsteinian sense. There's no way to convey this concept to a nonphysicist except by two-dimensional analogy (see How Does the Universe Curve? diagram). The surface of a sphere has what's called positive curvature; if you go far enough in one direction, you will never get to the edge but you will eventually return to your starting point. An infinitely large sheet of paper is flat and, because it is infinite, also edgeless. And a saddle that extends forever...
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