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So don't tell him that you told us.
Student dig unearths ancient gum A 5,000-year-old piece of chewing gum has been discovered by an archaeology student from the University of Derby. Sarah Pickin, 23, found the lump of birch bark tar while on a dig in western Finland. Neolithic people used the material as an antiseptic to treat gum infections, as well as a glue for repairing pots. Ms Pickin's tutor, Professor Trevor Brown, said: "It's particularly significant because well defined tooth imprints were found on the gum." He explained: "Birch bark tar contains phenols, which are antiseptic compounds."