Link to the Show / Show NotesPhilip Gulley-Isn't the concept of time interesting? I was trying to find out who invented the concept of time, but no one seems able to say definitively. Some scientists believe the moon was used to calculate time as early as the Palaeothilic Era, perhaps 30,000 years ago. We know the Sumerians, about 4,000 years ago, introduced the sexagesimal system based on the number 60. Thatâs why we have 60 seconds in a minute and 60 minutes in an hour. This past February, researchers at the University of Colorado at Boulder demonstrated a new clock based on the vibrations of strontium atoms trapped in a laser grid. This new clock loses less than one second of time every 200 million years. That's a lot more accurate than the clock in my office with wooden gears which loses three minutes a day, whose time I adjust by taping paper clips to the pendulum.
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