Thank you very much, David, and what a gorgeous day. Wow. And good morning, everyone! It is really my great honor to be here today for Caltech's 131st Commencement Ceremony. First, I'd like to acknowledge the faculty and trustees, and to thank Caltech's professional staff, the people who really do all the work to make these kinds of ceremonies happen. As a college president, I know what it takes. Let's thank them. And I also want to give a special thanks to you, President Rosenbaum, who I have