Books on diseases. You seem to have the whole library. [His tone is gently amused; a tone he's almost certainly used on Luke before. Although it's unthinkable that Luke would ever have every book in a library on a subject.]

I doubt there's anything to find; but there's no harm in looking.

[Since he appears to be welcome here, he pulls the chair across from her out and sits down -- angled to the side, to keep his legs out of her space.]