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This resource, authored by David Morrison, contains the National Aeronautics and Space Administration's Astrobiology Institute news story on new evidence of a 251-million year-old impact crater off the western coast of...
This set of multimedia resources, produced for the NOVA television broadcast 'Mass Extinction', explains mass extinctions in general, and in particular the extinction event that occurred at the end of the Permian period...
This press report from the University of Chicago provides information about research on the Chicxulub asteroid. Scientists present new results about the formation of spherules at the Cretaceous-Paleogene boundary in...
What, some ask, was the "last extinction?" It's a fair query indeed, and it happens to be understood as the period approximately 13,000 years ago when large animals were killed off across the North American continent....

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