It’s the holidays, college and university students are mostly back at home, and here’s a thought. There’s a great movie out about Abraham Lincoln, and with no classes to interfere, they ought to go to it and learn some American history. — Many students, you may not realize, don’t know beans about their own country’s past. Back some years ago, the American Council of Trustees and Alumni commissioned a study of how much seniors at 55 elite universities knew about fundamental, high school-level historical matters, and guess what. A startling 81 percent got either a “D” or an “F” on a test.