“Drake suggested that a large number of extraterrestrial civilizations would form, but that the lack of evidence of such civilizations (the Fermi paradox) suggests that technological civilizations tend to disappear rather quickly. This leads to the Great Filter, which notes that since there are no observed extraterrestrial civilizations, despite the vast number of stars, then some step in the process must be acting as a filter to reduce the final value. According to this view, either it is very hard for intelligent life to arise, or the lifetime of such civilizations must be relatively short.” – Wikipedia
OK, we already know how tough it is for intelligent life to arise. (I figure that in infancy at least half of our smart kids got buried under Simpson’s DVD avalanches.) I just find it tragically ironic that someone theorized that the reason we can’t find extraterrestrial intelligent life is that it tends to self-destruct rather quickly. So I guess the new motto is, Live Fast, Die Young and Leave a Good Brain.