"Structural iron and steel workers have parents who are structural iron and steel workers at a rate 155 times the rest of the population. This is higher than most of the jobs on our list." One thing I've noticed about steel workers, is that if you talk to them about their work, they'll start talking to you in an entirely different language, with all of the slang. As far as I can tell, you either know the slang from some sort of family connection or you don't. I think this generational reproduction is perhaps intentional.