Tree ring researchers use a metal increment borer to extract a pencil-thin sample from the tree, extending from the newest rings at the bark to the oldest rings at the center. The process does not cause permanent injury to the tree. Photo by Nicole Davi
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On Saturday, October 17, 2026 from 10am to 4pm, Lamont-Doherty Earth Observatory Open House—our biggest, best science fun and discovery event of the year—will take place on our beautiful campus in Palisades, NY. Mark your calendar and join us for this free, family-friendly celebration of science! RSVP Today!