Spelke is exploring whether some disparities on spatial tests reflect differences in men and women's preferred cognitive strategies. For instance, when asked to compare two figures in space, boys may be more apt to rotate one mentally until it resembles another. Girls may be more likely to compare features of the two objects point by point. "This difference in strategies gives men an advantage on tasks in which feature-comparison strategies are ineffective and gives women an advantage on tasks in which they are critical," she writes. This is still a working hypothesis, but a good reminder that test score differences are worth unpacking.