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> -- People are very sensitive to their internal CO2 levels. This directly
> drives the urge to breathe. Can you design a non-hazardous experiment to
> test this?
Pour a fresh soda with fizz into a tall glass. Fill the glass half way. If
it foams normally, you will have glass filled with a layer of CO2. Tilt
glass up as if to drink but breath in through your nose with liquid resting
against your lips. The need to take a clear breath is quite startling. Would
this be a valid demo?