Can we be really whom we claimed

Five months ago, when I just failed my first French test, I wrote the last journal, with full of sorrow. It was winter, the freezing temperature and heavy snow inspired the depression. Presently the two are gone, but the depression stays. Some...

Some thoughts in the winter

If one can really pull off his inner energy, I guess I've overdrawn it. Right, I get these wearing sentiment from time to times, like the days when I paced in the laboratory, depressed by the research, like more recent weeks I am learning 3 hours...

Rotations

Rotation, combined with translation and scaling, are the three affin transforms we do every day in the 3D nutshell universe. The rotation itself, however, is somehow much more complicated than the other two transform, it is one really needs a...