I am reminded of something I read in an article some time ago. One year a group of school children were taken on a tour of a hospital. At the end of the tour, all the boys were given doctors' hats and all the girls were given nurses' hats. The parents complained to the hospital; why were the girls given hats corresponding to lower-paid, lower status jobs? The hospital promised to do things differently the next year. A year later the group toured the hospital again and, once again, the girls came home with nurses' hats and the boys with doctors' hats. The parents complained again. "We did things completely differently this year" the hospital said; "last year we gave all the girls nurses' hats and all the boys doctors' hats. This year we asked them what hat they wanted, and gave them that."