Man is a gregarious animal. As such, he has historically sought the company of other men. He has organized his world into innumerable units-each with its own boundaries, each with its own laws. Once, when immobility and relative isolation characterized his existence, few legal complications arose from the policy differences that had been translated into the laws of his governments. His choice of law rules were relatively simple, predictable, and rigid. But as technology made Cairo as accessible as California-made international communication almost as practical as local conversation-the consequences of human interaction involved in- creasing interstate and international elements.