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Do photons bump into each other?

Daniel and Kelly’s Extraordinary Universe

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Is There a Forceparticle in the Universe?

We observe these things in the universe. That doesn't answer the question of why they are there. What we can do is think about, like, what other possible universes could you put together and then think about why we have this one. We see these amazing mathematical symmetries that tell us that the forced particles really do complement the matter particles for some reason. You know,why are there three kinds of tons? We have no idea. Mostly we're still pretty clueless about the answers to those questions.

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