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The Leap Year Explained

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Every four years, we gain an extra calendar day. But why? Neil deGrasse Tyson explains the science behind the leap year.

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Interested in Leap Year? Find out more about the historical context here.

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About TED-Ed Best of Web

TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

Meet The Creators