My son wants to know how we can perceive light and it not take up any space at the same time.
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Insofar as this question makes any sense on a particle physics scale, the answer is “no”. Photons are an example of a *boson*, a type of particle that can have more than one of the same exact particle in the same place.
Normal materials “take up space” because of the electrical repulsion between the electrons in the material, though, not because there’s no more space for particles.
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