It usually happens at the worst possible time. A child wakes up at midnight with a fever that will not break. A weekend hiking trip ends with a twisted ankle that is already swelling. A minor kitchen accident leaves a cut that clearly needs stitches, but it is Sunday afternoon and your regular doctor's office is closed. In moments like these, most people do not know whether they should rush to the emergency room, wait it out until Monday, or look for something in between. Tha