skeletons

Boy Wonder:  "Skeletons aren't just for Halloween you know.  They can be for history, too." 

Mom:  "And for science."

Conversation follows of examples from both sides. 

Boy Wonder:  "Yeah, skeletons are for history slash science."

Laughter from mom and sister. 

Boy Wonder, smiling:  "You like how I said that?  History slash science?"