Excerpt from Ultimate Clocks

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Title: "Ultimate Clocks" Author: W. Wayt Gibbs 

Publisher: Scientific American, Special Edition: A Matter of Time
Date: Spring 2012  Pages: 62-63 


In today's excerpt - the technology of our daily lives has become so advanced that the need for accuracy in clocks presses hard the most accurate of today's clocks - which are accurate to five parts per

100,000,000,000,000,000 (or five in 1016). Improving this accuracy is absolutely necessary for such things as improved GPS navigation, improved satellite communication, and improved detection of faults in the massive communication networks we now depend on:

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