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That really cool sticky, glass-like substance is called gummosis, and it’s actually a distress signal. Cherry trees produce this gum when they’re injured or fighting off disease, insects, frost damage, or other stress. As it dries, it becomes surprisingly hard, almost like natural resin. So For centuries, people experimented with dried fruit tree gum as a natural adhesive, in varnishes, and even as a chewing gum substitute when it was collected from healthy trees. Today, though, heavy gumming is