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That's a very good question. Unfortunately, modern science can't provide an answer. It was once thought that a grain of sand was the smallest object. But then the idea of the atom came along, and of course, then atoms were thought smallest. But then we discovered that atoms have components, and thought that those components must be smallest. And then we discovered that protons and neutrons are composed of quarks. By now, we have learned not to assume we've found the smallest constituent of matter, since we are usually wrong. Among candidates for smallest objects are singularities (minuscule points in space, such as at the core of a black hole), neutrinos, and the 'knots' of theoretical cosmic 'strings.' It's hard to say what the smallest object is.

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