Adhesive or glue is a compound in a liquid or semi-liquid state that adheres or bonds items together. Adhesives may come from either natural or synthetic sources. Some modern adhesives are extremely strong, and are becoming increasingly important in modern construction and industry. The types of materials that can be bonded using adhesives is virtually limitless, but they are especially useful for bonding thin materials. Adhesives usually require a controlled temperature to cure or set. They can be electrically and thermally conductive or nonconductive.. History The first adhesives were natural gums and other plant resins or saps. It was believed that the Sumerian people were the first to use them until it was discovered that Neanderthals as far back as 80,000 years made adhesives from birch bark.http://news.bbc.co.uk/2/hi/science/nature/1766683.stm The discovery of 6000-year-old cer

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