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Nicki Minaj is silly.

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2,000 Years of Chinese History! The Mandate of Heaven and Confucius:

Crash Course World History #7

In which John introduces you to quite a lot of ...

Hank tells us about the awesomeness of the periodic table and the genius of the man who invented it.

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In which John Green provides some historical context to the current civil war in Syria, discussing Syrian independence, the rise of the Ba'ath Part...

Right: https://www.youtube.com/wat...

Left: http://www.youtube.com/watc...

It Depends: https://www.youtube.com/wat......

Why do some years have an extra leap day and what is it for?

Also check out MinutePhysics' video: http://www.youtube.com/watc... & SciS...

It's leap year time... so what are years, anyway? And what do they have to do with the supermassive black hole in the core of the milky way?

Mr. G...