NOVA

These Ancient Stones Helped Track the Seasons

Along the river Gambia in Senegal, there are more than a thousand stone circles. The people who placed these stones would have observed how the locations of sunrise and sunset varied over the year.

These Ancient Stones Helped Track the Seasons

2m 57s

  • Lost Tombs of Notre Dame: asset-mezzanine-16x9

    Lost Tombs of Notre Dame

    S51 E18 - 53m 40s

    After the Notre Dame fire in 2019, two mysterious coffins were found buried beneath its floor. Where did they come from and who was inside? Follow scientists and historians as they investigate what their stories reveal about this iconic cathedral.

  • Hunt for the Oldest DNA: Extended Version: asset-mezzanine-16x9

    Hunt for the Oldest DNA: Extended Version

    1h 24m

    For decades, scientists have tried to unlock the secrets of ancient DNA. Follow the dramatic quest to recover DNA millions of years old and reveal a lost world from before the last Ice Age.

  • Building Stuff: Change It!: asset-mezzanine-16x9

    Building Stuff: Change It!

    S51 E17 - 53m 40s

    Humans have been altering Earth’s environment for thousands of years. And now, from electric planes to artificial noses, engineers are inventing new ways to preserve our planet.

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