The Stonehenge amid a cloudy sky. | From "NOVA: Ghosts of Stonehenge"

Ghosts of Stonehenge

Who built Stonehenge and why? Discover how the last decade of groundbreaking archaeological digs has revealed major new clues to Britain's enigmatic 5,000-year-old site and the people who constructed it.

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A to Z: How Writing Changed The World

Just as handwritten records changed how societies work, the printing press transformed the spread of information, igniting the Industrial Revolution. How did technologies -- from pen to paper to printing press -- make it all possible?

  • 2020-10-02T05:00:00-07:00
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  • 2020-10-04T15:00:00-07:00
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  • 2020-10-04T18:00:00-07:00
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Animal Espionage

Camera traps and drones are revolutionizing the study of wildlife by providing an up-close look at animals without disturbing them. See how these technologies are helping us understand everything from mysterious whale behavior to tiger migration.

  • 2020-10-09T05:00:00-07:00
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  • 2020-10-11T15:00:00-07:00
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  • 2020-10-11T18:00:00-07:00
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Nature's Fear Factor

When top predators disappeared from Mozambique's Gorongosa National Park, other animals fell into unusual patterns. Now scientists are reintroducing wild dogs to restore the park's "landscape of fear" and with it the natural balance of the ecosystem.

  • 2020-10-16T05:00:00-07:00
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  • 2020-10-18T15:00:00-07:00
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  • 2020-10-18T18:00:00-07:00
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Touching The Asteroid

If spacecraft OSIRIS-REx can grab a piece of an asteroid and bring it back to Earth, scientists could gain great insight into our planet's origins, and even how to defend against rogue asteroids. But NASA only gets three shots at collecting a sample.

  • 2020-10-23T05:00:00-07:00
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  • 2020-10-25T15:00:00-07:00
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  • 2020-10-25T18:00:00-07:00
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