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Glue is a sticky substance designed to attach one object to another. It can be made from natural substances, but these days is more likely to be synthetic. Glues have gotten so strong that some airplanes have their wings completely or partially stuck together with high-strength glues, such as the composite wings introduced to the A-6 Intruder in the SWIP upgrade. Glue was invented by the Sumerians and is often made from horses.