[kgwgk]

That links says: “Unsolved problem in physics: Are the three forces of the Standard Model unified at high energies?”

But we may be close, for some values of close :-)

[JadeNB]

> That links says: “Unsolved problem in physics: Are the three forces of the Standard Model unified at high energies?”

Indeed, that's why I said only that there were theories about it.

[kgwgk]

Sure, but the solutions to the solved problems in physics are also called "theories". I'm sure you knew the GUT is not yet done, it was just a clarification.

[JadeNB]

I always appreciate non-shouty clarifications of misunderstandings, combined with charitable interpretations of others' motives and knowledge. Thank you!