Wave-particle duality doesn’t mean that a thing is both a wave and a particle at the same time, or that it’s sometimes a wave and sometimes a particle.
What it means is that photons and electrons and so on are actually a third type of thing, and at some times that thing is best represented by what we would classically call a particle, and at other times it’s best represented by the classical idea of a wave.
But in reality, it’s neither.
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