https://www.pbs.org/video/when-a-tiny-land-bridge-triggered-an-ice-age-lg5sfd/
Dec 17, 2025 - Understanding the Isthmus of Panama.
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https://icebridgemovie.com/
A film about year-round life on Mackinac Island, highlighting the island's challenging but beautiful winters, and tracing the formation of an "Ice Bridge" to...
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