He looks at it, then up at her, and then back down at the image. More than anything else, he's struck by how many vertebrae she has - even more than he is by the extra set of arms. (It's hard to imagine Scully complaining about having an extra set of hands, especially now that she's back to labwork.) She's long and lean, and filled with more ribs than he's ever seen in a person before.

When he hands the palm pilot back to her, something in his face has softened. Part of him really is tempted to ask questions, all the prying details she hasn't shared. What he actually does is reach out and rest a hand on one of her bare feet - the closest part of her in reach. "Pretty impressive."