"Orion was the one Emily knew well. He had been Emily's childhood friend when, for several summers, they attended CTY, the Center for Talented Youth at Johns Hopkins. At eleven, twelve, and thirteen, they took courses in physics and advanced geometry along with other children selected nationwide. Emily had studied Greek, and Orion took astronomy. Renaissance children, they lived in dorms with other earnest middle-schoolers blowing through problem sets, practicing violin, gathering several times a week for camp games designated by their counselors as "mandatory fun."