This fall marks the arrival of the Class of 2024 on college campuses. This is the first cohort in which most members were born after the attacks of 9/11. A strange milestone. To honor the memory of those who died, and to help inform young adults of the events of that day, Keith Hennessey has crafted a study guide, available here. Keith was working on the Hill at that time and acknowledges that the passengers of Flight 93 may have saved his life. I had the good fortune of meeting Keith a few years later when my time at the Council of Economic Advisers overlapped with his time at the National Economic Council.