Wouldn't you know it - someone wants a better clock. Here's an idea of how to make an atomic clock with precision of 1 second in 30 billion years using a trick einstein called "spooky action at a distance."
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Do you have the time? NASA must have it quite precisely to pinpoint objects elsewhere (like rovers on Mars), and for your GPS receiver to work, the satellites must also know the time very precisely (and in turn, the receiver figures out the time as part of the solution to the equation).