Apples, a common New England crop, have been called the United States' "most endangered food." The iconic Texas Longhorn cattle is categorized at "critical" risk for extinction. Unique date palms, found nowhere else on the planet, grow in California's Coachella Valley--but the family farms that caretake them are shutting down. Apples, cattle, dates--these are foods that carry significant cultural weight. But they're disappearing. In Endangered...