It's a serious read, 34 pages, but very interesting, remarkable readable.<p>You upvoted two other articles about this to the front page, so I thought you might find the original interesting as wellThe other two you've linked to are:
<p>http://www.nytimes.com/2010/02/28/magazine/28depression-t.html?pagewanted=print<p>http://www.scientificamerican.com/article.cfm?id=depressions-evolutionary