You don't need things like the hunger for resources (be it rare materials or biomass) to find a reason why advanced civilizations will do interstellar travel. There is a much easier reason why they must travel between stars. Any civilization that handles the dangers of becoming extinct will at some point be forced to leave their own solar system: when their sun dies (unless they invented a technology that can rejuvenate stars).

Hmmm, I am in driving distance of Roswell and Marfa lights.

Might check out Aurora Texas also.

You know how funny us rednecks can be.

Weather balloons, atmospheric phenomena, and meteors/comets can explain pretty much all the lights you might see in the sky. The rest can be explained by confabulation and falsifying evidence.

Well two things are certain, I can't count!

It depends on your definition of ET. If we limit it to single-celled organisms, then I'd say that's most likely. We know that single-celled organisms can live without oxygen and single-celled organisms existed on the Earth for at least a billion years before multicellular organisms came about.

For intelligent life, that's harder to say. The Wikipedia page has a good sections on possible explanations to the Fermi paradox: http://en.wikipedia.org/wiki/Fermi_p...hypothetically

Here's another possible alien:
http://en.wikipedia.org/wiki/Waterbear

Mmm, weird little critters.

Almost forgot to mention "Ancient Aliens" TV series - yes it does contain false info but while it is not completely accurate it does contain a lot of interesting and real information that will start your curiousity from which you will move further - like ancient construction site mysteries. It can be watched on youtube btw. ^^

I think giving aliens the credit for building great monuments is somewhat of an insult to ancient architects, especially considering their lack of sophisticated tools. It just proves that what you need most is a good mind, and you can make do with less sophisticated tools.

The most interesting shows are the ones that show modern engineers trying to reverse engineer how the ancients built the structures.

O rly? Then explain how everywhere on Earth same type structures were built? What knowledge was used, where it came from and why none today know how to recreate it and why even using modern machinery we lack results? Actually i believe there are people groups who know but they hide it..question is - why? Also there were also some person who kinda prooved and actually knew how it was done but once again he took his secret in grave and refused to reveal it and left us only results - few books and Coral Castle creation. Doesn't this activate inner question - Why is it so important yet kept in secrecy??? Cause it might be key to solving this puzzle.

Maybe but i have yet to see any show where modern engineers actually succeed in reverse engineering..

I don't see any reasons why aliens should visit earth, build some monumental buildings and leave without leaving any other hint for their existence. I rather see it like H_TexMex_H, some people in past times had brilliant minds, in the same way as some people in our times. Nikolai Tesla has invented mind boggling technology that was way ahead of his time and parts of it even today are not fully understood. That is in no way a sign that he was influenced by aliens, all it shows is that this guy was a genius. Why should this be different for ancient people? And why should simple geometrical designs, like pyramids, not be common throughout the world, especially to those people that had the knowledge to build monumental structures, for which a certain amount of planning is mandatory?

I saw a piece of a show on aliens where they said that all the geniuses of the past were influenced/assisted by aliens. Yet another insult to them.

I think the first thing that humans ever built was a mound. Pyramid or pyramid-like structures, because after all not all pyramids are the same even tho believers in aliens seem to think so, were an optimization and beautification of the mound. Also, as most houses at the time were cube-like, the pyramid or pyramid-like structure was the best choice while maintaining the cultural / religious significance of the mound. Believing in aliens adds unnecessary complexity and assumptions to something that can easily be explained without adding aliens.

I also saw on one of the alien shows about some underwater city somewhere in the Mediterranean. Somehow aliens were needed for its construction, when the more plausible explanation is that it was a city that simply sunk into the sea.

Rocks are long lasting material(maybe this is a reason why they were created)..pyramids point to Sirius(there is a myth about Sirius and beings living on it) and etc. clues - it makes perfect sense more than your theory that in past primitive, recently evolved from monkeys, humans using primitive tools and knowledge that was less than today knew stuff that we don't know today and then suddenly lost that knowledge after those structures were made and even after so many years we can't repeat same process. Is this joke or just brilliant acting? Missing links just prooves something is not revealed. It doesn't make any sense that in past humans could do more than we today and theory of evolving further..something is messed up!
Insult? Are you serious?! You were also born to this world clueless and while you grew up your development was assisted by your family, people around you, in school, in work etc. Does that mean you are worthless human being?

This is something we agree - underwater buildings could be made by humans and later just drowned but still it doesn't answer question - how they were built by primitive ways yet not today?

Here's the main problem which gets uprooted again and again: If you leave room for the unexplained, people will fill it with nonsense of various kinds.

It's a pity because there was an opportunity not long ago, when this void could have been closed once and for all, but someone stepped in and stopped it from closing. Although I don't agree with the move, maybe it was necessary.

According to biologists Homo Sapiens is around for a much longer time than when those monuments were built (famous biologist Richard Dawkins estimates 200-250.000 years, Francis Collins, director of the Human Genome Project estimates about 100.000 years for the existence of Homo Sapiens). Also, we are not directly evolved from monkeys (if you even can say that in that form, how do you think evolution works?), there were more human kinds in between us and our ancestors.
If you look at history you will find that from the beginning of what we know about history many civilizations vanished from Earth, many of them we know nothing about. So why would it be unlikely that this also happened with those people that built these monuments?
Why would aliens that have the technology to travel the stars need to rely on rocks to transport their messages? Shouldn't they have better ways?
Nope. A missing link only proves that a link is missing. Anything else is speculation.
In the past many people knew a lot more about how you can use plants for medicinal practices and even today (or at least in very recent history) people living in separated environments (for example people living in the South American rainforests or similar places) know many things about the powers of plants for medicinal usage that we people in the "modern world" just don't know. This is not because these people were visited by aliens, but because we aimed our research in a different direction. Nowadays scientists are looking at the powers of plants again, but they have to learn many things those people could have told them.

Still no aliens necessary to explain all those things.