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Sunday, February 2, 2014

YOU KHAN DO IT!

Mathematical impossibility?

Is SpongeBob's pineapple wrong?

Where did the sun come from?

Where on earth do stars come from?

Chinese history 1900-1945

What came before Communist China?

Just added from the California Academy of Sciences:
Biodiversity is important!

Why does biodiversity matter for childhood leukemia?

Learn something new at Khan Academy

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