"[P.W.] Bridgman . . . would say that a question that does not have operational significance,
that does not lead to an experiment of some sort, or an observation, it's significant.
I never have been bothered by the detailed or penetrating discussions about interpretation
of quantum mechanics." Linus Pauling. AHQP (Archive for the History of Quantum Physics), interview transcript part 2. Interview
by John Heilbron. March 27, 1964.