The sciences we are familiar with have been installed in a number of great 'continents'. Before Marx, two such continents had been opened up to scien… - Louis Althusser

What do children learn at school? They go varying distances in their studies, but at any rate they learn to read, to write and to add - i.e. a number of techniques, and a number of other things as well, including elements (which may be rudimentary or on the contrary thoroughgoing) of scientific' or 'literary culture', which are directly useful in the different jobs in production (one instruction for manual workers, another for technicians, a third for engineers, a final one for higher management, etc.). Thus they learn 'know-how'.

Marx compellingly proved it in Capital Volume Two, that no production is possible which does not allow for the reproduction of the material conditions of productions: the reproduction of the means of production.

The class (or class alliance) in power cannot lay down the law in the ISAs as easily as it can in the )repressive) State apparatus, not only because the former ruling classes are able to retain strong positions there for a long time, but also because the resistance of the exploited classes is able to finds find means and occasions to express itself there, either by the utilization of their contradictions, or by conquering combat positions in struggle.