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When a Tiny Land Bridge Triggered an Ice Age

Season 8 Episode 8 | 10m 27s

On land, the Isthmus of Panama kicked off possibly the greatest natural experiment in the history of life on Earth. In the water, this narrow strip of land did something completely different: it divided. And that division would have a much bigger effect on the planet than the land connection ever did.

Aired: 12/16/25
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