What's That in Your Hands?

It's been so quiet here this afternoon which is highly unusual.  I walked into the living room and there was J with a .......book in his hands.  He's been reading for hours!  I'm amazed.  Clearly I'm not going to disturb this rare phenomena, which makes me think, kids don't realize the potential power they hold over their parents when they are caught doing things that are good for them.