41.   Another possible explanation comes from tensions between big manufacturers and the tiny contract shops that sew many of their garments.

42.   Another possible explanation is that card buyers are warming up for the millennium, sure to be a bonanza for card-sending.

43.   Another possible explanation is that patients in the Massachusetts General study simply may have had more advanced disease or worse pre-treatment erection function than patients at Johns Hopkins.

44.   Another possible explanation is that the heat generated by the impact of a comet or asteroid could have jarred Earth out of a refrigerated state.

45.   Another possible explanation may be pilot reaction to the mild turbulence that the plane encountered.

46.   Another possible explanation could be the emergence of forward Rodney Rogers and a brief shooting slump Murray experienced in late January.

47.   Another possible explanation for the early fund-raising pace is the early presidential primary schedule, in which most of the major primaries will be over by late March.

48.   Another possible explanation is less comforting.

49.   As for what causes the bursts, the new findings have not changed the possible explanations.

50.   As a start, astrophysicists were considering two possible explanations for the strong X-ray emissions.