"Question the Answer" -- in Every Field but Evolution

Walking on the University of Washington campus here in Seattle last week, I saw a banner proclaiming, "QUESTION THE ANSWER." It's fitting that this flag is on the campus of a research university, where scientists and students from all disciplines seek knowledge. It's healthy to confront the fluidity and uncertainty of scientific truth. In reality, though, when it come to the mechanisms of evolution, current thinking discourages "questioning the answer" -- in the lab, and in the biology class...