[No serious or joking shock about Sans offering to do research, just--acceptance of it, and an additional suggestion, like this is something Sans does all the time. Like their working on this sort of thing together is something that happens all the time? What timeline is Papyrus from?] Maybe puzzles are out of style here. [They'd been falling out of fashion at home, too, more perfunctory tradition than things really capable of stopping people. Papyrus was pretty much the only one taking them seriously. Or maybe humans weren't big on puzzles at all? Sans never paid that much attention in history class; he's not sure.] As far as book go, it'll depend on how unfamiliar they are. But sure, we can hit up the librarian too. [If this is now a group activity...? That they're... Doing together...?]