Luckily, the ponchos were clear. So when rain fell steadily upon MIT’s 147th commencement in June, the Class of 1963 remained a formidable red-coated presence in Killian Court. Equally undaunted by the weather, President L. Rafael Reif joked that the rain was his revenge against those who got him wet during a huge Killian Court snowball fight in February. He offered the 2,635 graduates “one last problem set,” urging: “As you go out into society, I want you to change the source code. Rewire the circuits. Rearrange the molecules. Reformulate the equation. In short, I want you to hack the world … until you make the world a little more like MIT. More daring and more passionate. More rigorous, inventive, and ambitious. More humble, more respectful, more generous, and more kind…Find your calling! Solve the unsolvable! Shape the future!”