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How the world's longest underwater tunnel was built
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NASA’s first software engineer: Margaret Hamilton
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Spells, threats, and dragons: The secret messages of Viking runestones
lesson duration 04:35
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I grew up in the Westboro Baptist Church. Here's why I left - Megan Phelps-Roper
lesson duration 15:18
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Why should you read “Lord of the Flies” by William Golding?
lesson duration 04:48
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Why doesn’t the Leaning Tower of Pisa fall over?
lesson duration 05:06
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