To be standing here today is one of the big events of my life. It is indeed curious how many of the happiest experiences I have had have occurred in this country or have been associated with Americans in many parts of the world. But to be here as your foreign guest of honor—if, indeed, "foreign' is the correct word—is without doubt the highlight of them all; and to me who knows and likes so many of you and who follows so closely all that you do, it is a pleasurable and moving experience. The more so is it at the moment when you are celebrating your hundredth birthday, when you have grown to the full stature of your maturity not only in nationhood but in the advancement of scientific thought, when, as I said to some of you a year ago, you among all the nations must shoulder the