>> Again, if the blood reaches all the way to my head when it's 4 feet off
>> the ground, you would have thought reaching it when it's 6 feet off the
>> ground wouldn't be that much more difficult.
>
>    50% more total height requires at least that much more force, probably
> more.

According to Wikipedia, pressure increases linearly as a function of 
depth. So, ignoring any change in resistance to blood flow due to the 
altered configuration of my body, yeah, 50% more force is required.

It's still an unexpected result.

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