Paleontology: Older than Ever

While the unfolding mystery of Stonehenge traces some surprising knowledge of astronomy back to Stone Age Britons, the steadily growing evidence of paleontology is tracing life itself farther and farther into the past. Last week Dartmouth Professor An drew McNair reported to the Geological Society of America that he had discovered the remains of advanced forms of life 120 million years older than any recognized before. As for simpler, one-celled organisms, Harvard's Elso S. Barghoorn told the society that he has found them to be a billion years older than anyone had previously suspected.

Primeval Presumption. During an electron microscopic...

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