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Transition Times
Our ancestors’ big break came 66 million years ago, on the worst
day in Earth’s history. An asteroid slammed into our planet, set off
tsunamis and volcanoes and wildfires, and darkened the skies for
years. The disaster was the end of the dinosaurs (aside from birds)
but a new beginning for mammals—or at least the mammals that
survived. In our cover article, starting on page 28, paleontologist
Steve Brusatte fills out this origin story with fascinating new details
about the mammals that thrived in the Before Times and a deeper understanding of how some survived into the After.

科学美国人 Sсiеntifiс Аmеricаn-2022-06 英文版 PDF电子版 网盘下载:

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