Best Talk of Pop!Tech '08

The reason I like this talk so much (besides that it’s well-presented) is that it introduces us to the idea of invisible etiology.  Such a powerful concept, one that I feel has the power to help us solve so many mysteries, once we take it seriously.

Something that I’ve been thinking about lately: does homelessness have an invisible etiology (or etiologies), and if so, what is it?