People gain knowledge from life and books. I Our society is highly dependent of knowledge. Most important source of knowledge is books and experience. Even when, both are interconnected some people gain knowledge from one of them and others group of people gain knowledge from both of them. For instance, Albert Einstein could not have defined the relativity theory without gain knowledge, mainly from books such as Newton´s laws, for example. Furthermore, Mozart never when to school and just from his own experience composed most famous classical music in the world. Books and experience are instruments that lead people to gain knowledge throughout the life. In my opinion, none of them are more important than other; how important they are depends on each individual. First of all, people who go to university gain knowledge from books. In essence, subjects such as mathematics, biology and astronomy among others are important source of knowledge embodied in books. For example, in mathematics students will learn about Pythagoras theorem, which is a methodology to calculate the hypotenuse and sides of a triangle, instead of expending long time trying to find an answer by themselves without use an existing methodology. Moreover, in biology is easy to gain knowledge about the human evolution thanks to Charles Darwin theory. In other hand, when we talk about astronomy, we think in the NASA. Further researches have been tremendously successful thanks to information written in books hundreds years ago. If were not by books, our life would be hard. In short, books are an important source of knowledge and some people gain knowledge from it.