(CBS) The black blobs that have mysteriously shown up on the streets and sidewalks of Camden, New Jersey were at least partially explained Friday. State and county officials said the stuff is paraffin wax and poses no risk, but they won't venture a guess as to how it got to the Waterfront South neighborhood. Paraffin wax is used in industrial processes and for making candles. Camden County Health Department spokeswoman Lorraine Hynes said hot weather probably made the goo more noticeable, melting dabs of it into dark, waxy, half-dollar-sized splotches in an area with industrial facilities and homes. Solving the...