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In our area the prevalence of HP infection is similar to that in other studies: it increases steadily with age and shows en epidemiological pattern that is half-way between countries of high and low prevalence.

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This work has two purposes: a) To find out the persistence grade of some preconceptions which pupils of second year of B.U.P. have about fluid's statics. . b) To check whether the teaching method used is the adequate one for our pupils. Before the fluid's statics study was started we gave them five questions; two monts later we gave them the same questions again. The results show out that an important number of pupils strongly maintained the same wrong ideas they had before this subjet was studied.

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