Introduction to Chapter 2:

The study of physics is a tentative of mankind to explain the universe in which we live.
But physic can be mis-interpreted and/or misused for egoistic goals.
This is the reason why I decided to try to explain some of this science. Not because I have a higher knowledge of this science, but just because I am so ignorant myself that I can better understand which and why people are afraid by trying to understand physics.
First at all let me try to describe how I see science as part of the human knowledge of the universe:
I think that we are in a similar situation like a blind person who is in an unknown room and try to discover the room using his hands to scan the environment. Obviously he will never succeed in having a complete and correct "view" (knowledgment) of the place where he/she is. But as longer that he/she explore around, he/she can figure out what is around him/her.
And of course there is plenty of possibility to make mistakes.
It is also important to agree now, that everything that we describe is not full understood: there is always some part of it which has not yet beeing discovered. For this reason we have to work with a probabilistic view of the universe. In saying this, we admit that we could make mistakes, but also that we can correct them and increase the probability of reaching a good description of the universe in which we live.