Think those heavy textbooks you lug around couldn’t possibly get any duller? Think again. Every so often, textbooks are rewritten, and each time, they are made a little duller. It began in the 1960’s, as a much needed and well-intended effort to screen textbooks for racial and gender discrimination. Recently, however, this effort has crossed the line into ultra-sensitivity. In this case, both sides of the political spectrum are to blame. The far-right want to remove all materials dealing with immoral behavior and nontraditional family settings. The far-left want to remove everything that could be construed as sexist, racist, and...