Today I did bug fixing all the day. Can you understand this tiredness? My eyes were wore out by iMac display.

The difficulty of programming is that one small mistake can brake everything. If you missed one comma on your program, it is garbage at all. Machines never allow us to make any mistakes. Please remember your life, have not you made any mistake in your life? In case of me, I’ve made much mistakes in my life. I think that to be perfect is impossible.

However, I can agree that concept “one thing can change everything.” Accumulation of small details always compose totality. On this point, machines and humans may be not so different, machines are a little bit more crusty than humans.