One thing is true about urban legends: People love to repeat them. Better yet, they love to email them. In fact, owning a computer opens the door to a host of myths and tall tales about the care and feeding of your pricey info system. And because a computer can be an expensive, mysterious piece of equipment, many cautious people take some of this maintenance “advice” as fact. But rest assured, most of it isn’t. Here is a simple true-false quiz designed to help get to the bottom of common computer misconceptions. Finally, here is some information you can feel good about emailing to your friends.