Sky | Can't Sleep? Learn About the Atmosphere Above Our Heads

Concrete has shaped the modern world in ways most people rarely notice. This episode explores the history of concrete, how it is made, why it became one of the most widely used building materials on E...

29 Jun 30min

Crop circles transformed ordinary farm fields into the setting for one of the modern world’s most persistent mysteries. This episode explores the history of crop circles, where reports originated, how...

26 Jun 34min

Clocks have shaped the way humans understand and organize time for thousands of years. This episode explores the history of timekeeping, from ancient sundials and water clocks to early mechanical devi...

24 Jun 35min

Supernovae are among the most powerful events in the universe. This episode explores what happens when stars reach the end of their lives and why these immense explosions can briefly outshine entire g...

22 Jun 35min

Volcanoes have shaped Earth’s surface for hundreds of millions of years. This episode explores how volcanoes form, what happens beneath the ground before an eruption, the different types of volcanic a...

19 Jun 32min

Papyrus helped preserve human knowledge for thousands of years. This episode explores the papyrus plant, how ancient Egyptians transformed its stems into a writing surface, and how papyrus became one ...

17 Jun 29min

Skyscrapers transformed city skylines and changed the way people live and work. This episode explores the origins of tall buildings, the engineering breakthroughs that made them possible, and the glob...

15 Jun 34min

The platypus is one of the most unusual animals on Earth. This episode explores the strange combination of traits that make the platypus so distinctive, from its duck-like bill and webbed feet to its ...

12 Jun 30min