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.
Marlee Matlin refused to allow a hearing actor to play her Deaf husband in the 2021 film “CODA.”
Marlee Matlin visits the house she grew up in Morton Grove, Illinois.
Henry Winkler took Marlee Matlin in for two years while she recovered from a turbulent time.
Learn about Marlee Matlin, Oscar-winning actress and champion of the Deaf community.
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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Be Smart Season 13
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Be Smart Season 1
Seedless fruits are delicious, convenient… and completely unnatural.
What does randomness really mean? And why your digital life depend on it?
Why do we have different blood types? And why do we have blood at all?
How did dinosaurs become birds—and what good is half a wing?
Just how big would a telescope need to be to actually see an alien world in detail?
The key enzyme behind photosynthesis isn’t actually all that great at its job.
The oldest rocks on Earth are more than just ancient—they’re time machines!
This is one of the weirdest mysteries of human evolution: Why do we have grandmas?
Insects and birds have an awesome superpower that repels water and keeps them airborne in the rain.