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Can you survive the creation of the universe by solving this riddle?
lesson duration 06:24
856,065 views
601,467 views
414,262 views
1,114,664 views
1,649,372 views
232,748 views
2,930,305 views
1,547,372 views
1,787,167 views
Yes, scientists are actually building an elevator to space
lesson duration 05:19
759,851 views
8,101,050 views
659,905 views
519,607 views
874,023 views
502,015 views
Can you solve the rogue submarine riddle? Difficulty level: Master
lesson duration 06:19
1,068,030 views
33,606,174 views
How porn changes the way teens think about sex - Emily F. Rothman
lesson duration 15:13
595,189 views
309,813 views
824,764 views
2,616,212 views
765,802 views