Why you sweat, and why that's a good thing

We've all felt it: At first comes the trickle, and then the flood. It's embarrassed us, and even torpedoed a presidential campaign. But when was the last time you were grateful for … sweat?

Many are actually squeamish about sweat. Perhaps, said science writer Sarah Everts, because sweating is utterly out of our control. "Think of most other bodily fluids – peeing? Tears? You can usually hold those back to go to a private place to release them. But sweat? No way. You have zero control."

Everts is the author of "The Joy of Sweat." When asked why humans sweat, she replied, "Well, we sweat so that we don't die! Even just a few degrees up is a fever. So, we have to keep our body temperature in a very tight window, and sweat is how we do it."