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I thought it was:
N = N* fp ne fl fi fc fL
N* = the number of stars in my (our) galaxy.
The Drake equation is, of course, massively flawed. Without knowing anything about life on other planets, all guesses are wastes. All we know about is some information from 1 planet out of billions. We could very easily be a fluke, and the Drake equation doesn't seem to take that into account. Imagine that we wanted to make a guess at how many cereals were in the world, but we've only ever had or known about one box of Cherios. Without any information about production necessary to any other cereal, or even knowing if it is possible for cereal to exist outside your house, how could you take guesses about Special K or Lucky Charms?
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