The story of meat is the story of mankind. One primatologist claims that cooked meat may have started it all: Once prehumans heated their food, their bodies obtained more energy, causing them to reproduce better and survive longer. Humans' insatiable appetite may have eaten its way through prehistoric beasts, effectively modifying the food chain and, consequentially, the landscape. The next step was to take food on the road, and, after realizing salt could be a preservative, the Romans did just that to help expand their empire. From there the story goes global: In China, disease nearly wipes out their beloved pork stock; Americans discover how to mass produce chickens; Spam keeps soldiers fed in World War II; and the hamburger becomes the most ubiquitous of all meat dishes, with McDonalds claiming to sell 75 hamburgers every second. Today the food supply can barely keep up with the demand, and scientists are trying to find solutions for our hunger: in-vitro meat, insects and veggie Burgers.