Do you ever wonder why people grab at leaves and branches of trees when they walk by. We all do it and there seems to be no obvious explanation for doing so other than it just feels right. I do it from the windows of automobiles too. Whenever a branch is passing my way, I grab at it and yank off some foliage. Why? I have an original theory about this but it assumes the truth of evolution, and from another point of view, it is just additional evidence for evolution. Now if you believe ...