One of the easiest tools for disinformation is to exchange the words written below a photograph. The entire meaning of the picture can be varied like this:
- The visit of a school-group at a former international camp can change into a camp, where children are imprisoned (which happened in the Russian city of Petroskoy in 1944).
- Victims of war can change nationality. The picture of the brutal German soldier in World War II that was shown in many newspapers to demonstrate the so-called typical face of a murderer, turned out to be French and a victim in other newspapers.
- In 1976 a picture of children in a day-nursery in the GDR is taken: The children, coming out of the shower, were dressed up in terry cloth suits with stripes. The same year the photograph with the happily laughing boys and girls wins the contest "a beautiful picture". Two years later a small part of the photograph can be seen in a Christian magazine in West-Germany, supposedly showing children from a concentration camp in the USSR. The smiling faces now seem to scream. (source: Stiftung Haus der Geschichte der Bundesrepublik Deutschland (ed.): Bilder, die lügen. Begleitbuch zur Ausstellung im Haus der Geschichte der Bundesrepublik Deutschland. Bonn 1998, p. 79)
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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