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How old is an up-quark? If particles can be created out of nothing, then an up-quark, an example of a fundamental particle, has a finite age. However, if matter cannot be created out of nothing, as the First Law of Thermodynamics states, then matter like the up-quark (and also energy), has always existed and thus even if our Universe had a beginning, it was in the context of a beginning from pre-existing stuff.Read More