It’s easy to forget that John F. Kennedy lived such a short life. At 43, he was the second youngest president in history; when he died, he was younger than Barack Obama was in 2009. Kennedy’s presidency was brief —‘a thousand days,’ as the historian and Kennedy confidant Arthur Schlesinger Jr memorably put it — but included some of the most intensively covered episodes in modern history, from the civil rights movement to the Cuban Missile Crisis.