In the 1970s, radiocarbon dating flipped the Ice Age narrative on its head. For decades, we thought North America sat under an unbroken glacier for over 100,000 years. But evidence showed forests growing near Hudson Bay—the supposed center of the ice sheet—just 30,000 to 40,000 years ago. That means the Ice Age wasn’t one solid block of cold… It was dynamic, pulsing, and far more recent than we imagined. Suddenly, everything we thought we knew had to be rethought. The ice didn’t just melt slowly

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