Extras
See how secret letters written by Mary, Queen of Scots, were finally decoded.
Discover how two revolutionary ancient inventions changed the course of humanity forever.
An unprecedented discovery could reveal new information about Cleopatra’s reign.
Learn about Marlee Matlin, Oscar-winning actress and champion of the Deaf community.
Marlee Matlin visits the house she grew up in Morton Grove, Illinois.
Marlee Matlin refused to allow a hearing actor to play her Deaf husband in the 2021 film “CODA.”
Henry Winkler took Marlee Matlin in for two years while she recovered from a turbulent time.
A new generation of lions, cheetahs, and leopards comes of age in Botswana’s Okavango Delta.
Follow ancient humans’ journey into an icy and perilous new land.
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The West Texas desert has a surprising feature: a prehistoric ocean reef.
Meet the axolotl, Mexico City’s endangered, smiling salamander.
North Carolina’s Outer Banks may be one of the most dangerous coastlines in the world.
Florida's once endangered crocodiles are making a very unlikely comeback!
Scientists find the exact time of a massive quake using trees, soil and human records.
Can new scientific research help unravel the mystery of Cahokia's disappearance?
What happened to the once lush, now desert-like Colorado River Delta?
How is this groundbreaking experiment in Ecuador helping deforested rainforests recover?
Sea otters play a vital role in maintaining the balance of sensitive kelp forests.
Exploring LIDAR: Tech using lasers to reveal the deep history beneath our world’s surface.