71.   But even experienced Mac users spend some time scratching their heads over cryptic error messages and balky commands.

72.   But executives at Quantitative scratch their heads over complaints about fees charged to their shareholders.

73.   But beyond that, even technology professionals are left scratching their heads.

74.   But he also has them scratching their heads.

75.   But most salsa experts seem simply to be scratching their heads.

76.   But now, the offer is under assault as religious discrimination, an accusation that leaves Blenckstone scratching his head in bewilderment.

77.   But off camera, ABC staffers were scratching their heads.

78.   But it was the one that got away that left Stewart and the rest of his teammates scratching their heads Saturday at RFK Stadium.

79.   But researchers who are not affiliated with any of the groups are scratching their heads.

80.   But stockholders of the two software companies are going to be scratching their heads.