It seems like a simple question, but the answer involves a combination of physics, geometry, electromagnetic radiation, and biology. Learn why we perceive the sky as blue in this episode of BrainStuff.
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BrainStuff Classics: Why Are Some Americans Cancelling Columbus Day?
07:16

American Versus British English: What Are Biscuits, Muffins, and Pudding?
09:51

How Do Sunspots Work?
14:22