Recently I have been asked by almost everyone I met whether I had finished all my midterms. But the fact is that my midterm has not yet started. I have only one midterm on the coming Friday on Quantum Field Theory, which is a subject that you probably have not heard about before and will never in the future. From the name you can guess that I need to prepare for this midterm, and that is the case. I spent most of my Halloween weekend studying my QFT. After all, Halloween is kind of new for me. And rather than a costumed party, I would prefer a regular one...