I was thinking a lot about the universe lately and especially about how the universe works and about the true nature of the gravitational force. And what I realized is that there are so many things that we do not understand about the universe and that really scares the Hell out of me most of the time. The true nature of the gravitational force is one of them, the origin of mass and matter is the other mystery. Another mystery to me are the forces which drive human behavior. I am also trying to understand human behavior which doesn't quite make sense to me at all most of the time.