OIL CITY, Pa. - Letter carriers occasionally have to deal with angry dogs or maybe even a spider's nest in a mailbox, but a mean squirrel? Barb Dougherty, a 30-year Postal Service employee, said she was attacked and bitten Monday by a squirrel while delivering mail in Oil City, about 75 miles north of Pittsburgh. "It was a freak thing. It was traumatic," Dougherty told The Derrick in Oil City. "I saw it there on the porch, put the mail in the box and turned to walk away and it jumped on me." The animal ran up her leg and...