In a kind of geological mystery, scientists have known for decades that a massive ice sheet stretched to cover most of Canada and much of the northeastern U.S. 25,000 years ago. What's been trickier to pin down is how—and especially how quickly—it reached its ultimate size. One clue to answering that, Tamara Pico said, may involve changes to the Hudson River. Credit: T. Pico et al. Geology 2018]A graduate student working in the group...

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