An open question: the didactics of Sciences in the modem world. Here are mentioned the difficulties of the modern world to state the problem of didactics as far as a particular science is concerned, above all the Science of Nature. The difficulties are arising from the model of school our society is aiming at nowadays, the model of school completely different from that one of the past, it comes out the necessity to point out in which way the purposes of particular sciences have a place in that question.