Thanks to Him I've learned how to solve a linear algebra problem even when I had no clue what to do. He was/is absolute champion in that. At the exam, I've used his methods to approach the problem and my solutions were real different from what my examiner expected - so much that he marked my solutions as wrong(! :D), I had to point out that "wait; don't!, it IS correct" so the test correcting person had to actualy go though my solutions and proofs and really check them. I was right and passed the test.

Thank you so much Sir! OCW rullz!