Episode Clips

Can Bones Reveal How Dogs Evolved from Wolves?

Learn more about the evolution of our furry companions.

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Cat Tales

Goddess, demon, house pet? What does science say about the human relationship with cats?

Mysteries of Sleep

Why do we sleep? And what does sleep have to do with memory, trauma, and our emotions?

Polar Extremes

Paleontologist Kirk Johnson explores the dynamic history—and future—of ice at the poles.

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