Publisher, TEDEd, Video, YouTube
If you live in the United States, you may live in the Eastern Standard Time Zone. Or maybe you live in Mountain Standard Time or one of the other standardized time zones. But these time zones have not always been around. In fact, it's a fairly recent development. William Heuisler explains the history of time and how trains changed everything.
9 September 2013 Edit: 9 November 2017
User submitted, thanks to Quyen Nguyen