The time that ends up on your smartphone—and that synchronizes GPS, military operations, financial transactions, and internet communications—originates in a set of atomic clocks on the grounds of the U.S. Naval Observatory. Dr. Demetrios Matsakis, Chief Scientist for USNO's Time Services, gives a tour.
Welcome to a collection of videos I call Mind Juice. It's juice for your mind – a channel for only the best things I've found on Vimeo. Go on, take a sip.