The magnetic moment of the muon—a tiny property of a tiny particle—has long puzzled physicists. Experiments and theory haven’t quite matched up, leaving open the thrilling possibility of discovering ...

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About 80% of the universe's mass is thought to consist of dark matter. Yet, little is known about the composition and structure of the particles that make up dark matter, presenting physicists with ...

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The particles that are in an atom: protons, neutrons and electrons The particles that are in protons and neutrons: quarks The four fundamental forces: gravity, electromagnetism, the strong force and ...