The roasted seed of a tropical shrub that became one of the world's great traded commodities and, more importantly, the social fuel of modern public life — coffee gave the Enlightenment world a sober, stimulating space to gather, talk, and do business, while binding tropical growers to distant consumers through centuries of colonial agriculture and price volatility.
Somewhere in fifteenth-century Yemen, a small berry was roasted over fire, ground, steeped in water, and drunk for the first time as something recognizable as coffee. Within two hundred years it had traveled to every court in the Islamic world, colonized the coffeehouses of London and Paris, and set off a plantation rush that would remake the tropics. The drink is a mild drug. Its power was not only pharmacological. It was social: coffee gave the modern world a sober place to meet, argue, and transact — and built a global economy around the growing of it.