Feb. 13—Every day seems to bring the world closer to extinction. Today’s ratcheting up of tensions begins with a news item from the U.S. Embassy in Moscow, which issued a new travel advisory, warning American tourists and residents to leave Russia. Included among the reasons, is the Embassy’s assessment that “terrorist groups, both transnational and local” are planning to strike “with little or no warning … tourist locations, transportation hubs and systems, markets/shopping malls, local government facilities, hotels, clubs, restaurants, places of worship, parks, major sporting and cultural events, educational institutions, airports, and other public areas” in Russia.