Spearmint, peppermint, double-bubble. You may think that chewing gum is a modern invention, when in fact we've been chewing the stuff since the year 200. Both the product and the flavour have improved immensely over almost 2000 years.

Jennifer Mathews joins Dallas on Patented today. She is a Professor of anthropology in sociology and knows everything there is to know about chewing gum. Starting from chewing on Chicle found among Mayan ruins to the brilliant PR campaign from William Wrigley, chewing gum has an ever-changing, social and practical history.

Edited by Tom Delargy, Produced by Sophie Gee & Alex Carlon. Senior Producer is Charlotte Long

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Chewing Gum: From the Aztecs to Avocados