If you've seen rippling patterns in the blades of knives or swords, that's Damascus steel. Learn its history and how it's made today 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