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The Volcano Under Yellowstone
A giant cauldron of magma simmering beneath Yellowstone is threatening to blow.
Clip: S42 | 4m 28s
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Towers of Chalk in Kansas
Amidst the flat plains of Kansas are the gorgeous remains of an ancient inland sea.
Clip: S42 | 1m 11s
A Labyrinth of Lava
The big island of Hawaii is shot through with an underground labyrinth carved out by lava.
Clip: S42 | 1m 18s
Animal Mummies Preview
How and why did the ancient Egyptians mummify their pets and other creatures?
Preview: S42 | 30s
Sea Level Rise: When 1 in = 2 ft
Sea levels will rise by the same amount all over the world, right? Wrong. Here’s why.
Clip: S42 | 2m 42s
Digital Domain of Warfare
The Internet has become a battleground, and we need to protect ourselves.
Clip: S42 | 1m 56s
CyberWar Threat Preview
As internet connections multiply so do points of attack and risks to national security.
The Power of the Flood Myth
Scientists scour a marsh in the Middle East for signs of periodic Mesopotamian flooding.
Clip: S42 | 3m 32s
Space Pics That Amaze Scientists
We asked scientists, “What are your favorite images from space?” Here’s what they said.
Clip: S42 | 2m 52s
Ghosts of Subatomic Particles
The universe’s smallest particles fly down from space and emit from a radioactive rod.
Clip: S42 | 1m 42s
Invisible Universe Revealed Preview
Follow the historic rescue of Hubble—the space telescope that unveiled the cosmos.
Einstein’s Thought Experiment
Your perception of time depends on how you are moving.
Clip: S42 Ep23 | 1m 49s
What is Spacetime?
A mysterious concept changed the way we understand reality.
Clip: S42 Ep23 | 2m 6s
Gravity's Effect on Spacetime
Einstein's theory showed that time itself is affected by gravity.
Clip: S42 Ep23 | 1m 48s
Inside Einstein's Mind Preview
Retrace the thought experiments that inspired his theory on the nature of reality.
Preview: S42 Ep23 | 30s
North American Gold
When the Earth formed, most of the gold sunk to its core—but some remained trapped inside
Clip: S42 Ep22 | 2m 28s
Making North America: Human Preview
How has the land shaped our lives, from the arrival of the first Americans up until today?
Preview: S42 Ep22 | 30s
These Boulders are Alive
Dive down to rare stromatolites—key clues to the evolution of virtually all complex life.
Clip: S42 Ep21 | 2m 48s
How Panama Changed the World
Two scientists scan islands off Panama for clues to determine how the country was formed.
Clip: S42 Ep21 | 3m 41s
Making North America: Life Preview
How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?
Preview: S42 Ep21 | 30s
Secrets of the Ghost Forest
Meet the earthquake that drowned the Pacific Northwest.
Clip: S42 Ep20 | 3m 7s
Making North America: Origins Preview
Experience the colossal geologic forces that shaped our continent over 3 billion years.
Preview: S42 Ep20 | 30s
Time Travel in the Grand Canyon
What does this geological wonder reveal about North America’s deep history?
Clip: S42 Ep20 | 4m 33s
Making North America Sneak Peek
Host Kirk Johnson explores how the continent was shaped—and how it shaped us.
Preview: S42 Ep20 | 4m 3s