This is a guest post from Jason Riley. How do you determine whether someone is doing something naturally or whether they are simply trying to act natural? For Marines on patrol, the question would be, how do you know if the farmer is actually a farmer working his field, or if the person is observing you and collection information on you but is trying to act like a farmer? For cops, the question would be, how can you tell the difference between the guy who is standing on the corner, smoking a cigarette, and minding his own business and the guy who is a lookout for the local gang and is trying to act like he is "doing nothing?"