During the vast expansion of choice which has come about from the internet an old problem has taken a new and much more center stage prominence; how to effectively sort through vast volumes of options. Now the normal response to a lot of choices is to develop some filters; rules or heuristics to go by which weed out unlikely matches and allow one to focus on the likely ones. Now for simple choices with few variables, filters work great. The problem comes in when trying to apply simple filters to ...