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Nick Elinsky knew right away because siblings see through poker faces. He knew as soon as the quiz landed on the desk in front of his younger sister Abby during a morning class at the University of North Carolina in late September. The quizzes were designed to see if everyone had done the assigned reading. The day after a soccer game and with her family in town, Abby might have been a few pages behind.
"He's just sitting there laughing," Abby recalled of her guest in class that day. "Because he knows exactly what's going through my head.