"By the time he turned 5, Michael had developed an uncanny ability to switch from full-blown anger to moments of pure rationality or calculated charm — a facility that Anne describes as deeply unsettling. “You never know when you’re going to see a proper emotion,” she said. She recalled one argument, over a homework assignment, when Michael shrieked and wept as she tried to reason with him. “I said: ‘Michael, remember the brainstorming we did yesterday? All you have to do is take your thoughts from that and turn them into sentences, and you’re done!’ He’s still screaming bloody murder, so I say, ‘Michael, I thought we brainstormed so we could avoid all this drama today.’ He stopped dead, in the middle of the screaming, turned to me and said in this flat, adult voice, ‘Well, you didn’t think that through very clearly then, did you?’ ”"

Can You Call a 9-Year-Old a Psychopath?

(Source: The New York Times)