I just listened to a short podcast from the Skeptoid blog entitled, “Are We Alone.” It’s a good, succinct survey of the problems and obstacles to being optimistic about other inhabited worlds and intelligent civilizations — in terms of there being such a thing, our ever knowing it, and how our civilization and that one would ever detect each other. If you are a zealot about how there *must* be ET life, this might depress you (but a cold dose of reality is good for you). Nevertheless, the Skeptoid host still feels optimistic, but not because of any actual science. I know what he means. It just seems like there might be other worlds with life, but even so, the odds against there ever being contact are formidable. Have a listen!