We don't know bleep

I found that this movie, though kind of all over the place, expressed a sentiment that I have had for many years. This being that despite all of humanities successes and advancements in science, philosophy, and investigations into religion, we still don't really know anything. One discussion that I always liked to bring up to display this idea is that there is still a debate whether we are the only beings in the universe. After all, we are so far from being able to look into the deep realms of space, much less actually going there, but somehow there are people that are convinced that we are the only intelligent beings in the universe. How can we prove that? That's why I found this movie to be interesting.