Sigh... =__=

Tonight I have taken the DB exam. Sigh... I found many mistakes already. Hope it won't be too bad...

By the way, I discovered that the Lego Mindstorm motor has one unexpected function! If you connect one motor with another motor (using a wire), you can turn that motor by turning the axis of another motor! (Yup... I knew that is a simple physical fact, but that's so interesting.) I have no idea that the electrity generated by me can be that great... *o*