A Brief History Of (Keeping) Time

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: A brief history of time… Don’t miss our next video! SUBSCRIBE! ►► ↓↓↓ More info and sources below ↓↓↓ How did we come up with our system of telling time? Why do we divide the day into 24 hours of 60 minutes each, and put 60 seconds in each minute? Where does the definition of a second come from? And who decides what clock shows the correct time? There’s clearly a lot of questions when it comes to time. READ MORE: “Galileo’s Pendulum” - Roger Newton “Revolution in Time” - David Landes ----------- FOLLOW US: Merch: Facebook: Twitter: @okaytobesmart @DrJoeHanson Tumblr: Instagram: @DrJoeHanson ----------- It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D. Director: