i like to give aliens the benifit of the doubt and assume they're smarter than the current UFO sightings. i mean if they're smart enough to get here then we wont be able to see them, because of tech or otherwise.
the same goes for crop circles, yeah aliens are going to come from billions of light years away to write some grafitite (sp) in a farmer's backyard, sure. if they wanted to talk to us they would have the inteligance to look at our culture and figuare out who our leader is, its not that hard, and go talk to him offering gifts etc.
any sightings from before about 1700 AD, should be discarded. people were so superstitous and fearful in their belief of god that anything even slightly unexplained would be attriubuted to the devil. magic-making a ball change positions under three cups was considered the devils work. but we all know now that thats not the case. so someone seeing a "ufo"over their farm could be something perfectly natural, but since the peasant isn't all that smart, he might think its god or the devil.
Lanorel- the universe is about 15-16 billion years old, est., and it will exist for, either, forever, or another couple trillion years. and yes i agree with you that aliens existed before humans, and will after humans. we've only started sending signals to space for about 60 years, the chance that an alien race has come to the tech. level to recive and recgonize the radio signals, within our galaxy, is very remote.
*takes deep breath