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Hi Will
We've done this particular dance before, but I'll put this out there for those who didn't see it last time.
I don't think any credible astrobiologist or other scientist believes the Drake equation is actually a mathematical model for the frequency of intelligent life. Rather, it is intended to illustrate a point - that given the very large numbers involved (of stars, of planets, etc), even if the conditions for life are very very improbable (thank you Douglas Adams), you still wind up with a good number of planets with intelligent life.
You can quibble with the details and the variables, but that's not really the point unless you think there are additional variables that make life less likely.
Enjoy.
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A little silliness now and then is cherished by the wisest men. -- Willy Wonka
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