> But that just causes a weird feeling, not nausea. Your eyes may be at
> dissonance with reason, but reason is presumably the highest-level
> function of the brain, whereas nausea is among the most fundamental
> functions, that there is no such thing as nausea from a dissonance
> between perception and reason.

Can't they just train the astronauts to not suffer from this type of 
nausea as much? Or at least have it impact their functionality less. 
Being able to launch with slightly less fuel requried seems quite a 
strong goal to me.

IIRC from a course at University on flight mechanics, there is some 
empirical function that estimates a "comfort" level for a human in a 
flying craft. It was some weighted combination of linear and rotational 
accelerations in the various axes. Presumably the people determining 
these sorts of things have access to such requirements, and it's then an 
optimisation problem to use the minimum amount of fuel for a given level 
of "comfort" for the pilots.

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