The Drake equation
is filled with wonderfully
n numbers, like the probability
for life, then intelligent life to evolve.
Also with quite well known statistics
as how many stars have earth-sized planets
with similar enviornments (which we know
very well because the science of planet
formation is understood so well)
No, wait a minute, we don't know any of those
thinks, Doh!. I guess the Drake equation
might just be wrong then eh!