What do we really know about the food we eat? A firestorm of recent food-fraud cases, from the US honey-laundering scandal to the forty-year-old frozen "zombie" meat smuggled into China, to horse-meat episodes in the United Kingdom, suggests fraudulent and intentional acts of food adulteration are on the rise. While often harmless, some incidents have resulted in serious public health consequences. At the heart of these dubious practices are everyone...