landscapes, magical islands and the world-famous amalfi coast. the southern sun nurtures tomatoes that are the envy of the world and out in the hills, buffalo produce the milk for the finest mozzarella. but pizza wasn't born in the lush hills. it came from the darkest, poorest streets of naples and its story combines two of italy's favorite subjects, food and death. >> tv announcer: vesuvius explodes. italy's historical volcano bursts into the most fearsome and devastating eruption at least once in every century, it has heralded disaster. the volcano is this sort of ever-present threat, isn't it? it is. you know, it is on the landscape, you always watch it, and have it in your mind and in your eyes. professor elisabetta moro is one