It Takes a Team of Scientists to Calibrate a Tape Measure

If you've ever done even the most basic

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construction or DIY project, you've used a tape measure. What other way are you going to find the distance between two points, a crucial part of virtually any project?

But how do we know the measurements we make with our tape measures are accurate? How do we know that an inch on the tape measure is really an inch?

Here in the United States, that's the job of the National Institute of Standards and Technology. NIST maintains a 200-foot-long basement "tape tunnel" that they use to calibrate the lengths of tape measures for various companies. Take a look: