But variables like pedestrians in crosswalks, large crowds and vehicle wrecks can throw a carefully designed system out of whack, leading to annoying and pollution-causing traffic jams.
Obama's team made little secret of their intention to win broad support for his stimulus plan - an effort that yielded three Republican votes in the Senate and none in the House.
The failings of a rote-memorization system are well-known: lack of social and practical skills, absence of self-discipline and imagination, loss of curiosity and passion for learning.
These machinations lie behind all that has happened from the beginning of this century onwards, and as anyone can see, these attempts have all met with failure!
But the design is obvious, the purpose of selling so much to regulate civil aviation market, to protect the interests of formal agency, as it is to protect their own interests.
Iran was our biggest enemy. We had to defy them whatever the cost. Now Iran is building a weapons programme. Everybody knows it and nobody is doing anything. Why?
Teachers are our growth, are our friends, teachers care for us, their words and deeds, let us benefit for life, we pay for teachers efforts and sweat, we should Thanksgiving teachers.