More and more, I have the feeling that quantum theory and general relativity are both deeply wrong about the nature of time.

[I]n both quantum theory and general relativity, we encounter predictions of physically sensible quantities becoming infinite.

SU(5) is the most elegant way imaginable of unifying quarks with leptons, and it leads to a codification of the properties of the standard model in simple terms. Even after twenty-five years I still find it stunning that SU(5) doesn’t work.