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Re: Impacts and ETs

On Sat, 12 Feb 2005, Joe Cantrell wrote:

> Assuming, as most people do, that Chicxulub was responsible for the K-T
 extinction, which paved the way for mammalian radiations culminating in
high intelligence, how would the apparent dependence of the latter on a
pure chance event affect estimates of the frequency of intelligent life
in the Galaxy?

_And_ assuming also, that mammalian cognitive abilities had nothing to do
with the K/T faunal overturn...