Time has a fascinating history. Much of our modern world wouldn't be what it is today without the development of better and better clocks. From clocks that use pendulums, to those that use cesium, this video covers the complete history of one of humanity's greatest inventions. Email: WendoverProductions@gmail.com Twitter: @WendoverPro Attributions: Sundial footage courtesy of http://natureclip.co.nr/. Map of Great Britain - Single Color by FreeVectorMaps.com Visuals provided by Wikipedia Commons Additional Footage provided by VideoBlocks LLC Licenses available upon request