51.  For some unknown reason, he recently stayed up past midnight in Lexington watching a televised Husky game.

52.  For some unknown reason, it is developing along the same mathematical principles that govern the organic development of plants in the natural world.

53.  For some unknown reason, Sang stood near the boy during much of the ordeal, and was sitting next to him when he was shot, Robles said.

54.  For unknown reasons, a normal protein called a prion twists into an abnormal shape, usually in the brain.

55.  For unknown reasons, African Americans are more likely to fall victim than others.

56.  For unknown reasons, Hill paid the overtime bill even though the judicial panel found fraud.

57.  For unknown reasons, it strikes more women than men.

58.  For unknown reasons, Mondays tend to be low-volume days on which stock prices sometimes, but not always, fall.

59.  For unknown reasons, raising the temperature again accelerates the pasteurization, without damaging the albumin.

60.  For unknown reasons, the bacteria strains affect different parts of the body in different ways.