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Fossil footprints puzzling scientists are getting another look: These ‘have been in the mystery category for 40 years’

PennLive.com
PennLive.com
 2021-12-02
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WASHINGTON — Prehistoric footprints that have puzzled scientists since the 1970s are getting a second look: Were they left by extinct animals or by human ancestors?. When famed paleontologist Mary Leakey first uncovered the footprints in Tanzania 40 years ago, the evidence was ambiguous. Leakey focused her attention instead...

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