Five years ago: Umar Farouk Abdulmutallab (OO'-mahr fah-ROOK' ahb-DOOL'-moo-TAH'-lahb), accused of trying to blow up a U.S. airliner on Christmas, appeared in federal court in Detroit; the judge entered a not-guilty plea on his behalf. Vice President Joe Biden's mother, Jean Biden, died in Wilmington, Delaware, at age 92.