So...what, there's a week where everything important a Different touches turns to lemon sherbet? They didn't put that holiday on the staff calendar...

[He gingerly sets it aside, as if spilling the contents would ruin his work and not just make a sticky stain, and sighed. He perks up a bit, however, at the question, and smiles.]

I'm an astrophysicist. I teach some at Columbia so this is for my PhD students.

[He pats the textbooks smartly.]

You?