양병택의 아름다운 세상 양병택의 아름다운 세상

http://m.site.naver.com/0WZP8 People 11 Can You Repair This? There was a boy who was good at math. He was famous for handling machines. The boy became a young man. One day，a professor came to see him. “Can you repair this engine?" the professor asked. “Yes， of course，" he answered. While he was repairing the engine，he found out its energy efficiency was very low. He transformed it and invented t..