Some people find it impossible to sleep without background noise, like a fan whirring. Researchers have identified the possible culprit. Learn how it works in this classic episode of BrainStuff.
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American Versus British English: What Are Biscuits, Muffins, and Pudding?
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How Do Sunspots Work?
14:22

Did the Lost Continent of Lemuria Really Exist?
11:05