America's ability to produce food is one of the major achievements of modern science and industry. It's almost too successful, as no less than 40% -- almost half — is wasted. There's waste in farming, transportation, processing and distribution. But the most wasteful place of all is the American home. Do you understand what those "sell by" or "use by" or "best by" dates really mean? Probably not, because the answer is different in different places. We hear what can be done to waste less up and down the food chain at a time when one in six Americans don't have enough to eat.