U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Education

SI Superheroes Videos

Share

Emerging from their environmentally shielded world headquarters at NIST, the SI superheroes are dedicated to the fight against uncertainty, imprecision and inaccuracy and to improving the quality of our lives and the things we build.

Episode 4: Two Truths and a Lie

League of SI Superheroes Episode 4: Two Truths & a Lie
League of SI Superheroes Episode 4: Two Truths & a Lie
After rescuing Monsieur Kilogram and capturing Major Uncertainty, our Superheroes take a break and play a game of "Two Truths & a Lie". More info at www.nist.gov/kids

Episode 3: Mass Hysteria

Mass Hysteria
Mass Hysteria
The nefarious Major Uncertainty has kidnapped Monsieur Kilogram, putting the world’s measurements of mass in jeopardy. As the world spirals into Mass Hysteria, the remaining SI Superheroes, champions of the metric system, leap into action to save the day, and hopefully Monsieur Kilogram as well.

Episode 2: Running Out of Time!

Running Out of Time!
Running Out of Time!
In their second suspenseful adventure, the League of SI Superheroes battle archvillain Major Uncertainty in a race to keep the world's satellite navigation system "on time".

Episode 1: Desperate Measures!

Desperate Measures!
Desperate Measures!

 

Metrology and Standards
Created August 1, 2022, Updated August 31, 2022