So I read this article in the NY Times and was struck by how one little line can say so much about, well, pretty much everything:

"In so-called attachment studies, young children or primates who are confident in their mother’s affections tend to be confident when exploring an unfamiliar room or meeting a stranger.

Whether you can relate to this sort of thing or not, chances are you know someone who can. And it's a good article. So you should read it.