The chess-board is the world; the pieces are the phenomena of the universe; the rules of the game are what we call the laws of Nature.  
The concept of law is a complex one, and it is not easy to define.
"The best books are the ones that leave you a little bit different than when you started."
The information paradox is one of the deepest puzzles in theoretical physics.
Don't tell me how good you make it; tell me how good it makes me when I use it.
树枝迎来南北飞鸟,树叶送走往来清风
I don’t like stress. I don’t like debt. I don’t like to worry. So I try to buy things that are cheap enough so that if they don’t work out, I don’t lose much.