Sweat is good. When you’re too hot, the sweat evaporating on your skin can cool your body off. Sweat also provides a good waste disposal system for your body, getting rid of toxins and other waste products as it cools you down. However, for top athletes who sweat a lot, too much of a good thing can spell trouble. Learn more on this Moment of Science.
What is called the "silent disease," because you abruptly fall and end up with a bone fracture or a collapsed vertebra?