What is a particle? What is a planet? What is reality?
Keywords: String theory
Scientists always try to approximate reality with increasing accuracy. We don't always go straight for the jugular and state reality, since we simply do not know enough. We suggest new theories that describe the universe better and then see new theories that describe even more about the universe. Science is an ongoing investigation of the universe.
To describe what is common between fermions and bosons and to unite the graviton with the rest of the Standard Model, scientists re-introduced particles as vibrating strings. More could be explained here:
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I find string theory very abstract, but extremely fascinating. How about you?
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