...if you need to live with less water. Turns out humans need about half as much water as chimps do, despite sweating a lot more. Even our breast milk has less water in it.
It's probably a savannah species versus forest species difference.
And our noses are part of why. Despite not being that large, our noses actually capture water vapor we're breathing out.
(Which might explain why if you're engaged in heavy activity and end up having to breathe through your mouth, you get thirstier).
And it took us this long to work this out...
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