When Daniel Field first saw it, his shouts echoed down the hall. “That moment was probably the most shocking moment of my life, certainly the most shocking moment of my scientific career,” he says. The chunk of rock didn’t look like much. It was small and uninspiring, about the size of a deck of cards, says Dr. Field, a paleontologist at the University of Cambridge. But fragments of birdlike bone poked out of it, and it was from the last days of the dinosaurs, so it bore further scrutiny.
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