> I was speaking about long-lived unsolved problems Yes, and the word "unsolved" in there is the exact selection bias I was referring to. Of course if you loo

> I was speaking about long-lived unsolved problems Yes, and the word "unsolved" in there is the exact selection bias I was referring to. Of course if you look at the universe of "unsolved" problems you don't see any verified solutions! It's a tautological statement. If you were looking specifically at unsolved problems, of _course_ there are no solutions yet. That was the definition of the term!