The heat of nuclear weapons is enough to melt sand into glass. Learn the story of trinitite, the glass from the first atomic test site, 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