The Coes, both anthropologists with a culinary bent, delve deeply into the history of their mouth-watering subject. The material on ancient cultures is particularly fascinating--did you know that the Maya used unsweetened liquid chocolate as currency? And in a chapter called Chocolate for the Masses, they detail the modernization of chocolate manufacture, which has allowed more than 25 million Hershey s Kisses to roll off the conveyor belt each day.