Sweat can get a bad rap, but it is a normal function that keeps the body cool and acts as a subtle—and sometimes not so subtle—way of communication. Not all sweat is created equal, though. There are ...

Imagine two scenarios. In the first, you’re hiking uphill on a warm day, beads of sweat rolling down your forehead. In the second, you’ve just remembered you have an exam tomorrow and now the palms of ...