I`m Bob Doughty. And I`m Shirley Griffith with EXPLORATIONS in VOA Special English.Today we travel around the world exploring the history of chocolate. Its story begins with a plant whose scientific name, Theobroma cacao, means "food of the gods." For centuries, people have been enjoying the rich flavor of chocolate, a product made from this plant.Join us as we tell about the history of chocolate and how it is produced. We will also meet Jane Morris, a chocolate maker in Washington, DC.(MUSIC)Most people today think of chocolate as something sweet to eat or drink that can be easily found in stores around the world. It might surprise you that chocolate was once highly treasured.Researchers at the University of Pennsylvania recently released a study.  It suggested that people in Central and South America first gathered the cacao plant much earlier and for a different use than experts once thought. The researchers examined the chemistry of substances found in ancient clay containers...