chrisensell, via FlickrAt a little over 4,000 characters, this story from U.S. News & World Report is running our attention spans ragged -- but we think what they're doing today is throwing a national spotlight on two University of Texas at Dallas professors who've harnessed the awesome power of Twitter in their classrooms.History professor Monica Rankin gets a nod for inviting students to tweet her with questions during lectures, which then show up on an overhead projection screen, which sh