books.google.com - What started with the sundial has, thus far, been refined to a level of precision based on atomic resonance: Time. Our obsession with time is evident in this continued scaling down to nanosecond resolution and beyond. But this obsession is not without warrant. Precision and time synchronization are critical...http://books.google.com/books/about/Computer_Network_Time_Synchronization.html?id=pdTcJBfnbq8C&utm_source=gb-gplus-shareComputer Network Time Synchronization
