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A Brief History of Timekeeping - History Of Timekeeping - It's time for another leap second! Join SciShow as we celebrate by exploring the long and strange history of timekeeping. Hosted by: Michael Aranda ... 

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A Brief History Of Time(keeping) - History Of Timekeeping - Viewers like you help make PBS (Thank you ) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate A brief history of time… 

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