All this talk of N2 and narcosis. Have any hypobaric studies been done (breathing pure O2 at 0.21 bar) to see if our IQ - or whatever parameter of brain function you choose :) - IMPROVES in the ABSENCE of any N2 in our inspired air? This is not quite the same as breathing normobaric 100% O2 as the extra O2 may give confounding effects. Bob Talbot #"WHATEVER happens to you when you willingly go underwater is #COMPLETELY and ENTIRELY your own responsibility! If you cannot #accept this responsibility, stay out of the water!" Poor old instructors who sometimes UNwillingly go underwater!
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