Changes Still, disinformation and propaganda are nothing magic. They can change things, but supposedly only if those things/meanings/opinions are not fixed completely. Galileo Galilee was not capable of changing people's opinion about the world being flat until some persons got suspicious that this long-believed-in truth was a mistake. The propaganda of his experiments which made him famous was not enough. On the other hand later all the propaganda of his enemies could not turn back the wheel of enlightenment, as people thought it was more logic to believe in a round world than in a flat one. It is never just a single idea that changes. Society is following the changes. Thinking about disinformation brings us to the word truth, of course, and to the doubt that there is no definite truth. And truth can easily be manipulated to another truth. Just present some facts that seem to be logic and there you've got a new truth. And if the facts can supposedly be proved by empirical studies then the quality of the truth definitely rises. That's what ideologies do all the time. And the media like to do the same thing - as a game with power or mere presentation of power? But of course there also exist bits of disinformation which are more amusing than evil or dangerous: - the theory of the celestro-centric world/"Hohlwelttheorie" - the story of the German philosopher who invented an Italian philosopher, wrote books about him, even reprinted "his" texts, which had gone lost pretendedly 100 years ago - and finally lost his job and all his career when other scientists found out that everything had been made up.

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Expert system Expert systems are advanced computer programs that mimic the knowledge and reasoning capabilities of an expert in a particular discipline. Their creators strive to clone the expertise of one or several human specialists to develop a tool that can be used by the layman to solve difficult or ambiguous problems. Expert systems differ from conventional computer programs as they combine facts with rules that state relations between the facts to achieve a crude form of reasoning analogous to artificial intelligence. The three main elements of expert systems are: (1) an interface which allows interaction between the system and the user, (2) a database (also called the knowledge base) which consists of axioms and rules, and (3) the inference engine, a computer program that executes the inference-making process. The disadvantage of rule-based expert systems is that they cannot handle unanticipated events, as every condition that may be encountered must be described by a rule. They also remain limited to narrow problem domains such as troubleshooting malfunctioning equipment or medical image interpretation, but still have the advantage of being much lower in costs compared with paying an expert or a team of specialists.

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