Many ways to track time

In 1905, Albert Einstein published his theory of special relativity, teaching the world that time is relative. In the science fiction novel “The Hitchhiker’s Guide to the Galaxy,” author Douglas Adams declared that “Time is an illusion, lunchtime doubly so.” And in March of every year, Daylight Savings Time begins, reminding us again that time isn’t absolute as we set our clocks ahe...

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