Claytor’s brusque manner intimidated most of his students, who couldn’t keep up as the professor furiously scribbled mathematical formulas on the chalkboard with one hand and just as quickly erased them with the other. He moved from one topic to the next, making no concession to their bewildered expressions. But Katherine, serious and bespectacled with fine curly hair, made such quick work of the course catalog that Claytor had to create advanced classes just for her.
