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Can you survive the creation of the universe by solving this riddle?
lesson duration 06:24
864,521 views
603,992 views
414,538 views
1,126,323 views
1,660,638 views
233,443 views
2,945,077 views
1,558,722 views
1,796,209 views
Yes, scientists are actually building an elevator to space
lesson duration 05:19
760,691 views
8,124,724 views
665,816 views
520,453 views
884,456 views
502,927 views
Can you solve the rogue submarine riddle? Difficulty level: Master
lesson duration 06:19
1,076,841 views
33,761,587 views
How porn changes the way teens think about sex - Emily F. Rothman
lesson duration 15:13
595,658 views
310,079 views
827,989 views
2,625,110 views