90 YEARS AGO: Academic freedom was defined today for 2,500 of the nation’s educators as “the freedom of the learner to learn, not the freedom of the teacher to teach.” The educators debated the role of public education in the present changing social world. The advocacy of new social doctrines in the class room was vigorously attacked by Frank W. Ballou, Superintendent of Schools for Washington, D.C. “Teachers should confine themselves to giving pupils a clear idea of the existing…