Scott82

This is correct and you wouldn't be the first to propose this. My own knowledge of astrophysics is very limited but if this topic interests you, you might want to read How You Can Explore Higher Dimensions of Time and Space by T.B. Pawlicki. Early on in this book he seems to be suggesting something very similar to what you are speculating about a curved universe. My memory of his book is vague so I may have some details wrong, but Pawlicki seems to have a bizzare, but for that reason very intrigueing, model of the universe in which it is bent somewhat like a torus with an outer and inner 'surface' which can be traveled between at it's 'poles'. Speculative, but worth contemplating.

I imagine the relationship, like so man in nature, is reciprocal. Certain cultural factors may exert pressure which leads to the growth of certain behavioral phenotypes like psychopathy while behavior in turn affects culture. In the case of psychopathy, this seems like a truly vicious circle: Primary psychopaths create a cut-throat enviroment which encourages people with latent psychpathic traits to become secondary psychopaths in order to survive.

Are you talking about the case when two sources of gravity exactly cancel out each other? I'm aware of 2 instances of this in nature: The 1st is what we call the langrange points between any 2 orbiting bodies. At the 5 lagrange points the gravity of the 2 bodies neutralizes and allows anyone at this point to stay relatively at rest without falling towards either body. The 2nd is theoretical in that I think it would only work in a planet-sized hollowed-out sphere. If you were within such a sphere, the gravitational faces exerted by it's inner arc should cancel out exact, leaving you free-floating. Regarding your question, I don't think there would be any difference between a space where gravitational forces neutralize one another and a place where there is no gravity at all.

Enough of them could. Some physicists speculate that the invisible dark matter that keeps the galaxies from flying apart could be composed of near masslass neutrinos which are currently shooting out of every star in astronomical quantities as it burns away it's fuel.

In a singularity there is space, it is just very small and extremely warped. But we don't know if the universe will end in a singularity. If neutrinos turn out to have mass, it may be enough to pull everything back. Otherwise it will just keep on expanding long after the last star has gone out...