For generations, physicists were sure the laws of physics were perfectly symmetric. Until they weren’t.
Symmetry is a tidy and attractive idea that falls apart in our untidy universe. Indeed, since the 1960s, some kind of broken symmetry has been required to explain why there is more matter than antimatter in the universe—why, that is, that any of this exists at all.
But pinning down the source behind this existential symmetry violation, even finding proof of it, has been impossible.
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