Residents of Jerez de la Frontera, Spain continue to explain the nuances of exchanging goods and services through a network of "zoquitos," a kind of local currency. While it has not yet happened fully, some of them envision a day in which their community might live without money in the traditional sense.

Spanish mushroom pickers explain about a few of the many different types of mushrooms. While some are edible, sought-after delicacies and others have the medicinal qualities of vasodilators and aphrodisiacs, still others are poisonous when eaten and can even cause death.