Why haven't we found intelligent alien civilizations? There may be a 'universal limit to technological development’

[Dave]

Science gives us everything. It is the foundation of so much that we learn. If you prove something exists; it exists. Disagreements or arguments are the method in which all of us learn new ideas. It is essential we all continue to disagree while keeping an open mind.
Earth is not the center of the universe. If an intelligent lifeform wishes to observe us and remain hidden there is little we can do to stop it. Our science in this scenario is primitive and it is rendered useless. Again, in this scenario we can rely on credible witnesses if we choose to do so. We can also ignore them. Yes, the government is the only source of information on UFO'S, UAP'S and reverse engineering. They have the information and when we ask them for the information they have only one answer: classified. The public has a right to know the truth in a free society. Ironically, most of the credible witnesses against the military, come from the military. It's a backlash they cannot stop, The floodgates have opened. The good news is that congressional hearings will continue again and again and again. Another hearing is scheduled soon, possibly next month.

Always we search in the skies and the heavens for signs of life on other worlds. And we search for intelligent life. Why do we search? We know its out there.

 

[finiter]

Gelis-Filho correctly points out our limitations. ULTD is real. Even colonising Mars and creating fusion reactors are beyond our capability, beyond the limit set by nature.
In my opinion, there are intelligent aliens, and most probably, they will resemble us. Human brain represents the zenith of evolution. Super intelligent beings/AI is just a fiction.