Wikipedia:Today's featured article/August 1, 2004
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Quantum mechanics is a physical theory that describes the behaviour of physical systems over small distances. It is the underlying framework of many fields of physics and chemistry, including condensed matter physics, quantum chemistry, and particle physics. It is derived from a small set of basic principles, and explains four types of phenomena that classical mechanics and classical electrodynamics cannot account for: quantization, the uncertainty principle, wave-particle duality, and quantum entanglement. (more...)
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