Cite your references Larry. Especially the African and South American native data. And don't change the subject. TTS and effect of aging on hearing are not the same thing. BTW, attacking me personally detracts from the debate at hand and obscures your good points otherwise. Argue your point and defend your ideas vigorously and we'll all learn. Retreating to the personal attack is the weakest possible defense of a concept. Regarding the Heisenberg Uncertainty Principle, it certainly asserts that the exact position and momentum of hadrons cannot be determined but why? Because the observation of the event affects the outcome of the determination. It's that simple. Thus my use of the term is indeed analogous. But the metaphor is not lost on me.