"I remember when I took calculus in college the only book I took home over the Christmas holidays was my calculus book. I wanted to do those word problems. I worked on one problem for the whole two weeks before I solved it. It wasn’t that hard, but I just didn’t understand the process involved. When the light dawned, I was so happy! I don’t believe I ever felt so rewarded. It was a major breakthrough. I was hooked. After that, to the amazement of my fellow students, I recall sitting on campus doing calculus problems for recreation."