A brief history of time… Don’t miss our next video! SUBSCRIBE! ►► bit.ly/iotbs_sub ↓↓↓ 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 amzn.to/2yQri5E “Revolution in Time” - David Landes www.worldcat.org/oclc/890167780 ----------- FOLLOW US: Merch: store.dftba.com/collections/its-okay-to-be-smart Facebook: www.facebook.com/itsokaytobesmart Twitter: @okaytobesmart @DrJoeHanson Tumblr: www.itsokaytobesmart.com Instagram: @DrJoeHanson Snapchat: YoDrJoe ----------- It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D. Director: Joe Nicolosi Writer: Matt Caplan, Ph.D. and Joe Hanson, Ph.D. Editor/animator: David Schulte Producer: Stephanie Noone and Amanda Fox Produced by PBS Digital Studios Music via APM Stock images from Shutterstock www.shutterstock.com