While you may think a bit of time in the sun may be fun, time outdoors during a heat wave can be deadly. You'd think it would be easy to define what a heat wave is, but actually it isn't. Thus, although a heat wave is a meteorological event, it cannot be assessed without reference to human impacts. Though defining what constitutes a heat wave might be difficult, agreeing that they are increasing seems to be easy. Here are five heat wave safety tips to help you deal with the dangers."