Taylor Klein will remind you of someone you know. A math-whiz engineer from an engineering family, her Facebook feed is littered with photos of her eating ice cream, studying, and enjoying the great outdoors — the most innocent of pastimes. We are introduced to her via video diary, where she compliments her mother’s strong work ethic and extols the virtues of school. “I never once broke the rules, because I was too scared of what would happen if I did,” she explains. “I think my teachers were concerned because I...