The theory of evolution argues that over (a long) time, small mutations in DNA that benefit the species will become more and more prominent and eventually every member of the species will have that new trait because the members with this trait are more likely to survive and pass that trait on. Likewise, traits that weaken the species will eventually be weeded out.
So why haven't humans evolved non-sweaty armpits? Sweat is supposed to cool off our body by evaporating, but sweat doesn't evaporate from armpits. It's completely useless. And if that's not enough, people with sweaty armpits smell bad and therefor are less likely to get dates which in the long run will make them less likely to get married and pass on their trait for sweaty armpits. Therefor if evolution were accurate, humans would have evolved non-sweaty armpits long ago.
Yao Ming is already way ahead of us. Apparently, his armpits excrete honey instead of sweat:
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