The expression "It's a small world," has been used with such monotonous regularity over such a long period of time that it has lost most of its original force and is now little more than a "catch phrase." Yet in these days of air travel at sonic speeds, of radiotelegraph communications at hundreds of words a min-ute, even the most obdurate isolationist must admit that this post-war world is vastly smaller than the one he knew in 1939.