APD is primarily defined as a lack of empathy,' I said. I'd looked it up too, a few months ago. Empathy is what allows people to interpret emotion, the same way ears interpret sounds; without it you become emotionally deaf. 'It means I don't connect emotionally with other people. I wondered if he was going to pick that one.' 'How do you even know that?' she said. 'You're fifteen years old, for goodness' sake. You should be ... I don't know, chasing girls or playing video games.' 'You're telling a sociopath to chase girls?