[Clearly there had been a distinct lack of formal education for this kid, which normally wouldn't be anything to mock. After all, not everyone had the same opportunities, but the fact that the questions came on the heels after a conversation about space travel.]

Memories and emotions are processed in the brain, not the heart. The heart is literally for pumping blood around your body. [Was this how Moira felt when trying to dumb something down for him sometimes? No, she would definitely insult him in her own way. Either way, he was going for full literal just to be a pain.]

Hearts are literally conducive to life. Without one, you're dead.