An article about research in beer flavours and, especially, off-flavours.

A Skunk Walks into a Bar . . .: Science News Online, Dec. 3, 2005

Rather simplistic and generalizing, typical of the perspective of “mega-breweries” (taking flavours out of beer instead of making sure the beer is flavourful in the first place). But somewhat effective at conveying the idea that beer is a complex thing.