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USA Science & Engineering Expo Winners

visitors to NIST booth and USA Science Engineering Expo

NIST writer and social media coordinator Mark Esser illustrates the importance of accurate measurement to a curious expo patron.

Thank you to everyone who visited the NIST booth at the USA Science & Engineering Expo! We hope you enjoyed learning about measurement science and all of the amazing work our researchers do.

Three people proved themselves to be measurement experts at our "How Good a Ruler Are You?" measurement challenge. They have each won a personal tour of NIST's laboratories in Gaithersburg, Md., with up to nine of their friends and family.

The Winners:

Hope Rosner and Bella Femia accurately estimated the weight of 20 "golden" paperclips to be 9.2 grams (they weigh 9.256 grams +/- 0.001 mg, to be exact).

Clare Singer came closest to the correct measurement for the distance between two lines on our pre-measured metal bar. She estimated the distance to be 804.06 millimeters (the actual distance was 807.02 mm +/- 0.20 mm).

Thanks to everyone for participating!


NIST tour director Jennifer Huergo helps expo-goers construct origami sundial wristwatches.

If you see your name here, please contact Jennifer Huergo at (301) 975-6343 or Jennifer.Huergo [at] (Jennifer[dot]Huergo[at]nist[dot]gov) to make arrangements for your tour.

To learn more about NIST and measurement, please spend some time on our website: If you are a student in middle school or elementary school, please check out our kid's page.

To keep in touch with our research you can follow us through email alerts, Facebook, Twitter, and YouTube.

Released October 25, 2010, Updated January 24, 2023