We understand why we perspire when we’re exercising–as our sweat evaporates, it cools off our body. But why do we sweat so much when we’re under stress? And this is the really stinky kind of sweat, the kind we apply deodorant to try to stave off.

And we’re under more stress than ever: Americans spent almost $3 billion on deodorants and antiperspirants in 2011, an increase of 13% from 2008, when the current recession first hit.
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