How much do you really know about conception and staying fertile? If you're like most of us, it's far less than you think. In fact, when it comes to enhancing our fertility, many people have a lot to learn, says Pamela Madsen, executive director of the American Infertility Association (AIA). Her organization sponsored a recent Web-based survey on the subject. The results were startling: Only one in more than 12,000 women could answer 15 questions about their reproductive life cycle! Here are eight surprising fertility facts that every couple should know.