Be Smart:Why It Is What Time It Is (The History of Time) Season 5 Episode 36
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Be Smart:Why It Is What Time It Is (The History of Time) Season 5 Episode 36
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.
PBS2017年11月6日
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