"Yes, of course I checked it multiple times but mistakes do happen and, as much of a know-it-all as I may be, I do make them on occasion. Anyway, the reason I was staring at you, you see, is because that day you appeared to me with a nearly completely solid crown and I was so surprised and startled that I didn’t know quite how to react. I’m afraid I not only rudely ran off but also apparently gave you the impression that I was staring at a mark on your head." She smiled apologetically. "And I suppose I was, but not one that anyone else could see. In the weeks since, I’ve only seen a couple incredibly faint matches and one stronger match in an unqualified person – I seem to have missed a key component in my original equations that would have disqualified him."