I think the piece of this week that interests me the most is perhaps Kalmbach's article on why we didn't more aggressively use typewriters in classrooms. I'm attracted to his idea of the "Liquid Paper" metaphor, that image and looks really interests students because they see the finished perfect product as something to take pride in and to encourage better grades. The metaphor is certainly compelling, because it appears to make sense on a "common sense" level, but I imagine that it's more complex than he lets on, right?