Twenty-three duct-taped packages chilled in a refrigerator at Columbia University's Lamont–Doherty Earth Observatory in Palisades, N.Y., for months before scientists finally got up the nerve last December to pull them out and peel them open.
Neil Pederson's team had initially chickened out. His tree-ring experts knew that the 200-year-old fragments inside were of interest to more than just their fellow dendrochronologists.
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