In a recent paper, Lubinski and his colleagues caught up with one cohort of 320 people now in their late 30s. At 12, their SAT math or verbal scores had placed them among the top one-100th of 1 percent. Today, many are CEOs, professors at top research universities, transplant surgeons, and successful novelists. That outcome sounds like exactly what you’d imagine should happen: Top young people grow into high-achieving adults. In the education world, the study has provided important new evidence that it really is possible to identify the kids who are likely to become exceptional achievers in the future,...