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Can you survive the creation of the universe by solving this riddle?
lesson duration 06:24
866,784 views
604,490 views
414,594 views
1,128,881 views
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233,597 views
2,947,579 views
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Yes, scientists are actually building an elevator to space
lesson duration 05:19
760,833 views
8,128,006 views
667,069 views
520,820 views
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503,078 views
Can you solve the rogue submarine riddle? Difficulty level: Master
lesson duration 06:19
1,078,819 views
33,785,673 views
How porn changes the way teens think about sex - Emily F. Rothman
lesson duration 15:13
595,783 views
310,129 views
828,485 views
2,627,086 views