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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No. In fact, most things don’t actually occupy space.
Electrons refuse to share space with other electrons, but a photon or neutrino can pass right by.
The idea that a thing may be solid and occupy space makes sense to us because it seems true in the world of big things, but in the world of very small things it isn’t true anymore.
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