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## How Do You Measure It?

-  Age of Things 
-  Air Temperature 
-  Alcohol Percentage 
-  Body Armor 
-  Carbon Monoxide 
-  Cholesterol 
-  Detecting Smoke 
-  DNA Ancestry 
-  GPS Location 
-  Gravity 
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-  Credits & Feedback 

# HDYMI Credits/Feedback

## Share

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Project Manager: Robin MatereseWriters*: Alex Boss, Mark Esser, Jonathan Griffin, Gabe PopkinEditors: Ben P. Stein, Robin MatereseArt: Natasha Hanacek, Brandon HayesVideo**: Jenny Wang, David StewartWeb Design: Paul HernandezCopy Editing: Sarah HendersonScience Consultants: Denis Bergeron, Tina Butcher, Johanna Camara, Steve Choquette, Tom Cleary, Regina Easley, Georgia Harris, Richard Harshman, Sam Ho, Carol Johnson, Vincent Lee, Jacki Murray, Wyatt Miller, Andrew Novick, Melissa Phillips, Karen Phinney, Mike Riley, Stephan Schlamminger, Meghan Shilling, Aaron Urbas, Jason Waters, John Wright, Justin Zook 

Do you have feedback about this site? Questions you'd like us to answer? Please contact HDYMI editor benjamin.stein [at] nist.gov (Ben P. Stein). Your question could show up in a future update to this site!

## *Writer Credits

**Alex Boss**
                  - How Do You Know Your Food’s Nutrition Label Is Accurate?
                  - How Do You Measure the Depth of the Ocean?
                  - How Do You Measure the Percentage of Alcohol in Beer, Wine and Other Beverages?
                  - How Do You Measure the Acidity (pH) of the Ocean?
                  - How Do You Measure the 'Heat' of a Pepper?
                  - How Do Companies Measure DNA to Discover Your Ancestry?
                  - How Do You Measure Cholesterol in Blood Tests?

**Mark Esser**
                  - How Do You Measure Your Location Using GPS?
                  - How Do You Know the Age of Fossils and Other Old Things?
                  - How Do Smoke Alarms Detect Fires?
                  - How Do You Measure the Thrust of a Rocket Engine?
                  - How Do You Test Body Armor?
                  - How Do You Measure a Second?
                  - How Do You Know If Grocery Store Scales Are Accurate?
                  - How Do You Measure Air Temperature Accurately?
                  - How Do You Ensure That a Tape Measure Is Accurate?
                  - How Do You Measure the Strength of Gravity?

**Jonathan Griffin**
                  - How Do You Detect Carbon Monoxide? ​​​​

**Gabe Popkin**
                  - How Do You Measure the Age of a Tree?

## ** Video Credits

**David Stewart**
                  - Ballistics Testing at NIST

**Jenny Wang**
                  - What is PNT?

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