Often discrepancies between theory and experiment led to advancements in physics. This is also how quantum electrodynamics, or QED in short, emerged. Today, it is the most precise theory in physics and served as a blueprint for all subsequent field theories. However, as is known from cosmological observations, unknown physics beyond the so-called standard model must exist. It probably lies hidden where no one has been looking, e.g. at very high energies or extreme precision.
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