traffickin', by jonfeinstein at flickr The common rule of thumb is that there are eight or nine rats for every human being in New York City, which means a scurrying verminous population of 64-72 million lurking in walls, below streets, in trash cans, and sometimes in plain sight. Being a rat catcher or, better yet, a rat exterminator is a profession that will never end, and the NY Times spoke to some exterminators about......