Extras

    Video thumbnail: NOVA The Volcano Under Yellowstone

    NOVA

    The Volcano Under Yellowstone

    A giant cauldron of magma simmering beneath Yellowstone is threatening to blow.

    The Volcano Under Yellowstone

    Video thumbnail: NOVA Towers of Chalk in Kansas

    NOVA

    Towers of Chalk in Kansas

    Amidst the flat plains of Kansas are the gorgeous remains of an ancient inland sea.

    Towers of Chalk in Kansas

    Video thumbnail: NOVA A Labyrinth of Lava

    NOVA

    A Labyrinth of Lava

    The big island of Hawaii is shot through with an underground labyrinth carved out by lava.

    A Labyrinth of Lava

    Video thumbnail: NOVA Animal Mummies Preview

    NOVA

    Animal Mummies Preview

    How and why did the ancient Egyptians mummify their pets and other creatures?

    Animal Mummies Preview

    Video thumbnail: NOVA Sea Level Rise: When 1 in = 2 ft

    NOVA

    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.

    Sea Level Rise: When 1 in = 2 ft

    Video thumbnail: NOVA Digital Domain of Warfare

    NOVA

    Digital Domain of Warfare

    The Internet has become a battleground, and we need to protect ourselves.

    Digital Domain of Warfare

    Video thumbnail: NOVA CyberWar Threat Preview

    NOVA

    CyberWar Threat Preview

    As internet connections multiply so do points of attack and risks to national security.

    CyberWar Threat Preview

    Video thumbnail: NOVA The Power of the Flood Myth

    NOVA

    The Power of the Flood Myth

    Scientists scour a marsh in the Middle East for signs of periodic Mesopotamian flooding.

    The Power of the Flood Myth

    Video thumbnail: NOVA Space Pics That Amaze Scientists

    NOVA

    Space Pics That Amaze Scientists

    We asked scientists, “What are your favorite images from space?” Here’s what they said.

    Space Pics That Amaze Scientists

    Video thumbnail: NOVA Ghosts of Subatomic Particles

    NOVA

    Ghosts of Subatomic Particles

    The universe’s smallest particles fly down from space and emit from a radioactive rod.

    Ghosts of Subatomic Particles

    Video thumbnail: NOVA Invisible Universe Revealed Preview

    NOVA

    Invisible Universe Revealed Preview

    Follow the historic rescue of Hubble—the space telescope that unveiled the cosmos.

    Invisible Universe Revealed Preview

    Video thumbnail: NOVA Einstein’s Thought Experiment

    NOVA

    Einstein’s Thought Experiment

    Your perception of time depends on how you are moving.

    Einstein’s Thought Experiment

    Video thumbnail: NOVA Gravity's Effect on Spacetime

    NOVA

    Gravity's Effect on Spacetime

    Einstein's theory showed that time itself is affected by gravity.

    Gravity's Effect on Spacetime

    Video thumbnail: NOVA What is Spacetime?

    NOVA

    What is Spacetime?

    A mysterious concept changed the way we understand reality.

    What is Spacetime?

    Video thumbnail: NOVA Inside Einstein's Mind Preview

    NOVA

    Inside Einstein's Mind Preview

    Retrace the thought experiments that inspired his theory on the nature of reality.

    Inside Einstein's Mind Preview

    Video thumbnail: NOVA North American Gold

    NOVA

    North American Gold

    When the Earth formed, most of the gold sunk to its core—but some remained trapped inside

    North American Gold

    Video thumbnail: NOVA Making North America: Human Preview

    NOVA

    Making North America: Human Preview

    How has the land shaped our lives, from the arrival of the first Americans up until today?

    Making North America: Human Preview

    Video thumbnail: NOVA These Boulders are Alive

    NOVA

    These Boulders are Alive

    Dive down to rare stromatolites—key clues to the evolution of virtually all complex life.

    These Boulders are Alive

    Video thumbnail: NOVA How Panama Changed the World

    NOVA

    How Panama Changed the World

    Two scientists scan islands off Panama for clues to determine how the country was formed.

    How Panama Changed the World

    Video thumbnail: NOVA Making North America: Life Preview

    NOVA

    Making North America: Life Preview

    How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?

    Making North America: Life Preview

    Video thumbnail: NOVA Secrets of the Ghost Forest

    NOVA

    Secrets of the Ghost Forest

    Meet the earthquake that drowned the Pacific Northwest.

    Secrets of the Ghost Forest

    Video thumbnail: NOVA Making North America: Origins Preview

    NOVA

    Making North America: Origins Preview

    Experience the colossal geologic forces that shaped our continent over 3 billion years.

    Making North America: Origins Preview

    Video thumbnail: NOVA Time Travel in the Grand Canyon

    NOVA

    Time Travel in the Grand Canyon

    What does this geological wonder reveal about North America’s deep history?

    Time Travel in the Grand Canyon

    Video thumbnail: NOVA Making North America Sneak Peek

    NOVA

    Making North America Sneak Peek

    Host Kirk Johnson explores how the continent was shaped—and how it shaped us.

    Making North America Sneak Peek