The Engineer in the Family

My father-in-law have been in the construction business for quite some time now. Through the years, he has been able to purchase all the necessary equipments used in building houses. He has a pool of workers, and he just hires an architect to do the drawing. He is personally supervising the construction. He takes care of all the supplies including the very important industrial clamps. It really amazes me how he is able to understand everything, to think that he is not even an engineer. I can say that everything is based on self study and experience.