It is arguably no better written than the last time around, with the film again coasting on its technical aspects and sheer chemistry of its cast over a story that makes little sense and feels rushed.
Before being plucked from obscurity, he had enjoyed a respectable career as a chemistry teacher (sulphur dioxide was his speciality) at a technical university in the grim industrial south.
The BLS describes this particular group of salespeople as those who sell goods for wholesalers or manufacturers where technical or scientific knowledge is required, in such areas as biology, engineering, chemistry, and electronics.