LAST Christmas, for the first time, I sent a combined letter of thanks and holiday greetings to a United States senator. It was to Senator Fulbright whose bill, since it became law, has had considerable influence on the growth of world citizenry-and, incidentally, on my own development. I don't remember when I first learned about the Fulbright program. I suppose that I had been vaguely aware of it for some time when, one day, a newspaper story made me realize suddenly that advanced study abroad was within the scope of attainable reality! Eligibility requirements for the Fulbright award are broad and nonrestrictive: U.S. citizenship, a college degree or its equivalent, a working knowledge of the language of the specified foreign country, and good health. To apply for an award, you go first to one of two places-the designated Fulbright program adviser on campus