41.  For unknown reasons, shifting global weather patterns have brought more precipitation to the fjord-dented coastline.

42.  For unknown reasons, the drop was greater among men than women.

43.  For unknown reasons, the facilitator cells allow stem cells to proliferate in other species without producing the often fatal reaction known as graft-versus-host disease.

44.  For unknown reasons, the immune system does not defend against prions.

45.  For unknown reasons, about three-quarters of conjoined twins are female.

46.  For unknown reasons, Donohue crossed the dirt divider and drove the wrong way on the freeway, Sirovy said.

47.  For unknown reasons, multiple myeloma occurs about twice as often among blacks as whites.

48.  For unknown reasons, some people suffer invasive infection, while others remain healthy carriers.

49.  For unknown reasons, they require a lower dosage.

50.  For some unknown reason, Banana Pudding ice cream sells well in far West Texas and parts of Louisiana.