This book is first of all about epistemology. I am going to discuss the axioms that are unprovable assumptions of any science. A set of such assumptions may be different. Next, I am going to show that following from which particular set of the assumptions is taken, different general ways of understanding of what is scientific knowledge, and what is the general form of scientific theories emerge. These issues have been discussed for millennia and justifications for final forms of the relevant ideas accepted today can be found in the past. The ground...