Thank you! This was an amazingly informative article.
I have come across a couple of black bears with cubs in Yosemite. On two of these occasions, the bear clearly knew I was there, but seemed to not feel threatened, as she allowed the cubs to get relatively close and didn't seem to mind, and just kept walking the way she was headed. Only once, did the bear seem concerned. I stopped and stood my ground, (more out of sheer surprise rather than tactic) and the bear and cubs backed away.
What is so disturbing, is that on several occasions, I have seen tourists following either solo bears, or a mother with cubs in an effort to get photos/video, taunting them to get a reaction, and holding food out to try and get them to move closer. It never ceases to amaze me that there are people out there who have a complete lack of respect and understanding of the environment that they are in. Along with being conscious of your neighbors food habits in camp, I find myself being very concerned with their behavior when they come across a bear. I often wonder how these encounters will affect the future behavior of the bear when coming into contact with humans. When I saw the movie Grizzly Man, I wondered how Timothy Treadwell's behavior affected the way the bears interacted with humans later.