My dad grew up working on old-style dairy farms, and I grew up among cowboys. On dairy farms, they wear knee-high rubber boots for a reason. I don't see how anyone in that occupation could drink milk, but they did, and made home-made butter and whipped cream too, and mountains of cheese. As far as the pros of the Industrial Revolution and its later amenities like the evolution of engines, versus the cons of the terrible social and labor condition it led to, well, I'm sure Matt is whittling his censor pencil right now... but there might be some remote possibility of tying the invention of photography right into that all, and getting away with a few more words - probably not in my case, however. Fox Talbot used chemicals that came from somewhere.... perhaps coal mine sludge the poor were wallowing in? Time to read some Karl Marx and report back when Matt is sleeping. (Disclaimer - I don't drink milk, but do love cheese.)