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0:51 Economics
Why diamonds cost more than water
0:52 Mathematics
Fold a Paper 42 Times and Reach Past the Moon
1:05 Probability
Should you switch doors?
1:13 History
The stone that cracked hieroglyphs
0:48 Geography
Where Egypt Actually Lives
1:16 Earth science
The continents are still moving
0:50 Chemistry
Why Ice Floats—and Keeps Lakes Alive
0:48 Physics