It would be terribly convenient to circumnavigate the earth in a fraction of a second, to make a round trip to the sun in just over a quarter of an hour, to go to Neptune and back in a workday. Modern life is too busy to waste time getting from here to there, and flitting around at the speed of light--about 186,000 miles per second--would take a lot of the drudgery out of travel.
Forget it, though. You'll never go that fast. Albert Einstein said so. His special theory of relativity had at its heart an astonishing claim: the speed of...
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