1. David L.Surjik David L.Surjik Canada says:

    We consume more O2 as a necessity, than any other ingestable substance, gas ,solid or liquid.It is curious the Airline industry let BOEING make a design improvement to allow passengers to fly at healthier,6000 Ft.,. Equiv. Altitudes, while the Air travel Industry still clings to unscientific views as "time zone" causes for long flight air sickness!

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