Petitioners cite many factors in requests to lift requirements, including 'evolving scientific data' and natural immunity.

Most four-year and two-year institutions rebound well, showing that mobility is slowly returning.

Barry Mehler, a history professor at Ferris State University in Big Rapids, Mich., told his students he didn't want to know anything about them, not even their names and that he would randomly predetermine their grades, no matter how hard they worked.