The base of these chewing gums was made from natural substances such as spruce resin and chicle, a natural latex that Aztecs and Mayans chewed for hundreds if not thousands of years. Unfortunately ...

Tyrone Turner On a May morning in the National Arboretum in Washington, D.C., Jorge Santiago-Blay ducks under the branches of a Norway spruce to admire a thick white scab of resin that has oozed ...