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How did ancient civilizations make ice cream?

Lesson duration 04:55

How does an air conditioner actually work?

Lesson duration 04:54

Why having fun is the secret to a healthier life - Catherine Price

Lesson duration 12:34

Why does smoke follow you around a fire?

Lesson duration 05:26

Cicadas: The dormant army beneath your feet

Lesson duration 02:46

Why the Tour de France is so brutal

Lesson duration 07:10

Where does the smell of rain come from?

Lesson duration 03:10

What you might not know about the Declaration of Independence

Lesson duration 03:38

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