The spirit of adventure is strongly related to the desire of knowledge. In fact, we can say that the desire of knowledge (to have better and better ZMs) is driven by the spirit of adventure (to activate ZAMs that we know to be imperfect). Perfectionists are more goal-oriented, and not knowledge-oriented. Example (effects of perfectionism): The Americans have imposed the operating systems for computers and many programs associated with them. Perfectionists have created them. Their scope is to attain a goal and not directly knowledge. This spirit is incompatible with the European spirit and many Europeans feel it. Forced to evolve in a perfectionist type environment, the computer user becomes slowly but surely an accessory to the computer. Another example can be given associated with the negative effects of perfectionism. After the 9/11 events, the perfectionist American solution was the introduction of draconic customs and border rules and other homeland security rules, which are not efficient in any real situation. The perfectionists have no other available method. In Europe, the spirit of adventure and desire for knowledge is manifest, which means that the Europeans do not act according to 'rules' as perfectionists do, but use their independent capacity of learning and acting in a new unknown environment. We will see on long-term the efficiency of the European methods in a world in which, according to MDT, the dispersion of the human brain development level is increasing dangerously. ENDNOTES This book can create problems to the majority of readers. The main problem is connected to the assimilation mode of new knowledge. The usual way, promoted by the educational system at all levels is assimilation of story-type models (logically structured or not)in an image type environment. This book offers no chance to those who expect a story-type model associated with image models. It cannot be in any way associated to any image model. The book presents a single symbolic model; it has to be understood as it is, as a whole, based on logic. The basic requirement is to have the capacity to build and operate symbolic models. People who work in positive sciences (physicists, mathematicians, engineers...) are favoured, while others have little chance to understand anything. Some 'test' readers of the book were displeased by the repetition of several issues in different contexts. This method is mandatory when a new symbolic model has to be assimilated. The persons who have the tendency to build story-type models will be very much disturbed by the repetitions, as the repetition sends them back to the point where the statement appeared for the first time. This will fragment the story- type model. Once fragmented, it cannot be continued and a new story-type model has to be built. This produces irritation in this category of readers.