A Strange New Look at Time

New, more accurate clock makes us revisit the concept of time

"We can measure time much better than the weight of something or an electrical current," he says, "but what time really is, is a question that I can't answer for you."

Maybe its because we don't understand time, that we keep trying to measure it more accurately. But that desire to pin down the elusive ticking of the clock may soon be the undoing of time as we know it: The next generation of clocks will not tell time in a way that most people understand. ... " 

And after you have ingested that, more about the arrow-of-time from an even broader perspective.