An Atomic Clock on Your Wrist

via ieee spectrum

Having lived in Colorado for twenty years, there are a couple of things that you learn. One is that you always travel with a sleeping bag in your car in the winter and another is that there is an atomic clock in Boulder. This clock is the official wristwatch of the United States and is about as big as a Volkswagon. Recently Symmetricom of San Jose announced an atomic clock that is only a couple of inches on a side (or about as big as a large wristwatch). With a bit more work we will start seeing these devices in GPSs, cell phones and maybe even wristwatches. Then, everyone will really know what time it is.

For more info read this ieee spectrum article.