Scientists can now control the weather of the world if it wants to. That, at least, is the opinion of Dr. Frank R. Ruff, life-time student of the effect of climate on health. To bring frigid weather to Eu rope, for example, he recently said all that is necessary is to close the strip of ocean between the Florida Keys and the main land. The warm gulf stream flows through here on its way across the Atlantic to Europe. If it were cut off Europe would no longer have the warm current to mod erate its climate. — W est.