Open any cookbook, and you’ll find that the recipes provide instructions asking you to consider and make a note of the changes that happen and sensations that arise as you proceed through the steps. Watch a cooking show, and your mind steps into a world of excitement and wonderment. Eat at a restaurant, and your mind is instantly intrigued by the ambience, the meal, and, perhaps, the people you’re seated with. Biology plays an integral role in cooking and eating, and for any discussion on flavor, knowing why and how things work is important.