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1,788,175 views
Design, Engineering & Technology
How the world's longest underwater tunnel was built
lesson duration 05:38
3,214,322 views
5,142,021 views
620,103 views
1,188,369 views
362,856 views
1,437,852 views
Design, Engineering & Technology
NASA’s first software engineer: Margaret Hamilton
lesson duration 05:10
331,755 views
2,224,275 views
History
Spells, threats, and dragons: The secret messages of Viking runestones
lesson duration 04:35
655,823 views
606,091 views
3,390,656 views
361,098 views
4,469,473 views
2,097,317 views
917,899 views
432,260 views
3,388,052 views
Philosophy & Religion
I grew up in the Westboro Baptist Church. Here's why I left - Megan Phelps-Roper
lesson duration 15:18
6,553,727 views
5,517,262 views
285,151 views
Literature & Language
Why should you read “Lord of the Flies” by William Golding?
lesson duration 04:48
2,976,704 views
Design, Engineering & Technology
Why doesn’t the Leaning Tower of Pisa fall over?
lesson duration 05:06
4,758,875 views