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Everything in Quantum Mechanics does, not just light.

The reason it has to be modeled that way is because in experiments that are designed to detect particle behavior, things behave like a stream of particles, whereas in experiments that are designed to detect wave behavior, things behave like a wave. This has been verified experimentally with practically everything on the quantum scale: light, subatomic particles, atoms, thermal vibrations (phonons), quantum dots (composed of millions of atoms) in semiconductor crystals, etc.

Nobody really understands why nature is this way, we just know it is.

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Q: Why does light have a dual wave particle model?
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