People learn more outside the classroom
Let me use another approach to support my opinion. Suppose there were two children ,the first limited to getting his knowledge entirely from the classroom, the second one able to get information from any source .Which would learn more? Most likely the second one because he would learn from his environment, from his parents, from the books he read, from TV, and from private study.
Both history and common sense suggest , therefore, that the greatest source of useful , practical knowledge comes from outside the school What we get in a classroom is only a small part of that total , but of a specialized and abstract nature.
I believe that we get more knowledge outside the classroom than we do inside. A classroom can give us only limited kinds of information. If we look at the beginning of civilization ,for example ,we win note that people back then did not have formal classrooms yet many of them were well informed. There were no classrooms to teach the first men how to plant or how to build huts. The great early poets of the first and second centuries didn't learn their poems in a classroom, nor did the women find out how to sew their clothes there.

Scientific Discovery ----Curse or Blessing
New scientific discovery nearly always brings to mankind a blessing. Take electricity for example. Since its discovery, it has ushered in an era of countless inventions in close connection with it. Nowadays people can read and write by means of lights instead of candles. Fire is another example of discoveries which made human beings survive in ancient times and generates electricity in modern times. Again, minerals such as oil or coal discovered by man have long been used as fuel to develop industry and agriculture.
Yet sometimes scientific discoveries may prove a curse upon the human race. As we know everything has two sides. Electricity can shock one to death if used carelessly. Smoke from factories and gases from cars are terrible pollutants. Radium used in nuclear power plants can lead to a nuclear war.
The misuse of scientific discoveries must be prevented. Since chemical elements or substances were discovered, some have been made use of for purposes of war. Such weapons as atomic bombs or poisonous gases have proved to be destructive to mankind. Therefore, it is the whole world's duty to prevent them which menace the human race.

Preferable Work
Some people prefer to work with people. Work with people usually makes one feel interesting and efficient. At the same time, it can give people power and competition and provides rivalry which can be a very effective motive in improving one's ability. In addition, people can get better ideas by way of consultation and conference with other people.
On the other hand, other people like jobs which mainly involve with objects or machine. They probably think that working with objects or machine will provide more peace and quiet. Under such peaceful conditions, one can do more practical work, improve one's skill and make technical renovations.