"The equation was written in 1961 by Frank Drake, not for purposes of quantifying the number of civilizations, but as a way to stimulate scientific dialogue at the first scientific meeting on the search for extraterrestrial intelligence (SETI)."
PS: my bet is a) rare earth, b) Penrose-panspermia (non-earth life origin), c) multi-successive universe life origin (e.g. took more than one universe to figure out all the building blocks of DNA/RNA cell machinery…15-20 billion years not enough. d) the whole enchilada is a sim running on a game machine in some kids bedroom in a very advanced civilization in a parallel universe (i.e., it’s far stranger than we can possibly imagine) 😉
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