I thought the riddle said we can ask 2 questions, but it didn't specify we had to individually ask them up to 2 questions. If we can get away with the group question, "Are there 4 people in this room?" it'll work. But if we limit it to 2 questions total to ask any 2 individuals once or any one twice, we'll need to come up with a whole new set of questions. I'm still trying to figure this one out, its driving me nuts! Where's that John Forbes Nash guy from Beautiful Mind when you need him.