Who decides how long a second is? - John Kitching
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Did you know that many people around the world use atomic time daily? Watch this TED-Ed Lesson to learn how the GPS in your smartphone uses atomic time. You can also check the time whenever you want on the internet here.
The international definition of time, and other units, is organized by the Bureau International des Poids et Mesures (BIPM) in Sevres, France. There is also a Superhero Measurement League!
More information about time in the US can be found here.
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