They, the people in the know, say there are no two snowflakes alike. Just think of the trillions of snowflakes that fall every year around the world. And no two are alike?
Actually, that one has been debunked... two identical snowflakes have already been found... on the windshield of a passenger jet even.
As for intelligent life in the heavens, I think we need to find intelligent life on earth first...

j/k
Personally, I really don't think they care if the life out there is intelligent or not. They just try to find some kind of life... and I think it would be interresting either way, but as war of the worlds denoted, if we ever do find life elsewhere, let's hope we don't bring home any viruses or bacteria that we have no immunity to...