In What is Science?, Jaffe seeks to define science conceptually. Understanding our environment and ourselves is and has been the most important intellectual activity of mankind. It was only after the emergence of the empirical science (i.e. experiment philosophy) that humanity achieved accelerated social, economic, and technological progress. The emergence of science made possible the industrial revolution and the development of a multitude of scientific disciplines, all very successful in advancing our understanding of the world and of ourselves. What is the key that makes science more efficient in advancing our knowledge than any other heuristics?.