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A mass extinction comes every 62 million years, according to new research by UC physicists:

With surprising and mysterious regularity, life on Earth has flourished and vanished in cycles of mass extinction every 62 million years, say two UC Berkeley scientists who discovered the pattern after a painstaking computer study of fossil records going back for more than 500 million years.
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2005/03/10/MNGFIBN6PO1.DTL

The dinosaurs went extinct 65 million years ago.

We're 3 million years past the "sell by" date, and I'm seeing increasing evidence of it every day.
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