Vacationing in Alaska, I couldn't help but notice all the warnings about bears posted in campgrounds, visitors' centers and rest areas advising people not to feed the bears, how to avoid bears, what to do if a bear sees you, what to do if a bear attacks, and so on.

My favorite, however, was a hand-lettered sign on the door of a small gas station in a remote area. It said: "Warning! If you are being chased by a bear, don't come in here!"