Three weeks have passed after I settled down here in Ostrava. I found yesterday I first enjoyed a full day off since then. Actually, I began to re-write a paper in Hong Kong around on May 8th and worked on until the day before yesterday. This morning I went out for a walk and stopped in the middle and happened to get an idea that is somehow better than yesterday I had. I jotted it in a piece of paper I had in a pocket on me. Just after that, I felt dull ache on the head; back to my hotel room. Maybe, I need a rest for a while to organize and reduce in into equations.