The Quest to Perfect the Universal Standard Units for Science

The Quest to Perfect the Universal Standard Units for Science

For millennia, humans have turned to the sky to tell time.

 
 
Photo by wired.com

Our planet rotates once on its axis, and we’ve lived another day.

We divide that day into smaller fractions: the hour, minute, and second.

But Earth is an imperfect clock.

Its orbit and rotation vary slightly from year to year—the kind of wiggle room that makes it incredibly difficult for scientists to do their

 
 

 

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