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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
Why the Sky Is Blue
1:07 Biology
One Day in the Life of Your Heart
1:03 Astronomy