A strong, stimulating beverage with a distinctive aroma and complex flavor, coffee has been a popular drink for centuries. Brewed by the infusion of hot water and ground, roast coffee beans, coffee is enjoyed at any time of the day and night, though it is most associated with a morning pick-me-up. Coffee's primary active ingredient, the stimulant caffeine, is mildly addictive but to date no serious medical complications have been associated with its use. Local establishments such as cafés, coffee houses, coffee bars, and diners attract millions of customers worldwide. Specialty coffee shops serve dozens of varieties, each identified by the geographic growing region and degree of roast. Methods of preparation also vary widely, but in general coffee is served hot, with or without the addition of milk or cream, and sugar or other sweetener. Though coffee has always been popular, it wasn't until the 1980s that...