6. Relying on the ‘mill’, teachers draw an analogy between the more ‘detectivelike’
version of the story (i.e. after it has been retold) and scientific
investigation. They think about some paradigmatic episodes of scientific
investigation (epitomes of discovery and invention) in terms of the ‘operations’
recognised in the non-scientific context. This is the place where the narratives
(science stories) embedded in the unit are used to convey historical data (see the
next subsection). Following each narrative, one or two specific aspects of the
model of science as intervention are discussed.