A little rusty with your mathematics from way back when? I am. I have very fond memories of math in high school. I remember thinking, this is cheating. It’s not biology or history – so you don’t even have to study! You just do the math in the test, and voila! And now it’s 2012 and the venerable Massachusetts Institute of Technology (MIT) has put all its math and calculus courses on line (at http://math.mit.edu/classes/18.01/) and I can take a look and re-try some of the basic little problems of old times.