Here are the most common reasons for calling quantum mechanics weird. We’re told it says that: • Quantum objects can be both waves and particles. This is wave-particle duality. • Quantum objects can be in more than one state at once: they can be both here and there, say. This is called superposition. • You can’t simultaneously know exactly two properties of a quantum object. This is Heisenberg’s uncertainty principle. • Quantum objects can affect one another instantly over huge distances: so-called ‘spooky action at a distance’. This arises from the phenomenon called entanglement. • You can’t
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