Vaguely interesting article in CNN today about a scientist tagging black bears in Pennsylvania. Statistics on bear populations, hunting, etc. A brief excerpt:
Pennsylvania has had perhaps 20 bear attacks over the past 30 years, none of them fatal or even serious. But black bears have killed people in other states, and can inflict significant damage on crops and livestock.

Black bear encounters are rising in Pennsylvania and in many other Eastern states because the species is increasing in number at a time when more of their habitat is being lost to development.