Dishwasher Efficiency

As an anthropologist, I find the interface between technology and the larger culture in which it is embedded fascinating. You all know the old story of the family cook who habitually cuts the ends off the roast before slipping it in the oven. One day her child, hoping some day to be the family cook, asks why this is done. It turns out that nobody can remember, and the matter is dropped. But the question comes up again, at a later family dinner, this one attended by great grandma, who was the family cook a generation ago, and of course, she knows the answer. "Back in the day," she says, "…