Don't go outside with wet hair. You'll get sick if you do. Or will you?

Nope. Wet hair worn outside won't make you ill. Science proves it, say researchers at Baylor University. Here's how they know: They exposed 44 volunteers to the cold virus and had some stand in a chilly room and some in a toasty room. Those kept in the chilled space weren't any more likely to get the sniffles than anyone in the toasty room. That's because viruses cause colds, not wet hair or cold temps.

The best way to boost your immune system and keep healthy is to get enough sleep and exercise, according to SHAPE magazine. This way, your body can defend itself against any virus.