Buon Ma Thuot, Vietnam – The white-walled room in a house on the outskirts of Buon Ma Thuot, Vietnam’s coffee capital, is quiet. The only thing breaking the silence is the occasional beep of an electronic scale, or the sound of coffee being poured into a measuring glass. A handful of people, all wearing white lab coats, concentrate on their work. “This is really a lab,” says Nguyen...