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Glue is astickymaterial (usually aliquid) that can stick two or more things together. Glue can be made fromplant or animal parts, or it can be made from oil-basedchemicals.
The first glues may have been natural liquids that come out oftrees when they are cut. Later, people learned to make glue by boiling animal feet,cartilage or bones. Some very strong glues were first made from fish bones,rubber ormilk.
A simple glue can be made at home by mixingwheat, flour and water. This glue will stick pieces of paper together.Many kinds ofart can be made using glue. Acollage is a work of art made by using glue to stick coloured things ontopaper.
Some glues can be used to keep water out ofboats,buildings orvehicles. In this case, the glue may be calledcaulk. Some man-madematerials, including wood-like materials, are made using glues to bind together small pieces of material orpowders.
While many glues are safe, certain kinds of glue contain strong-smellingchemicals. Some peoplesniff these glues to get high. Sometimes people breathe in thevapors by mistake. This is a very bad idea because these chemicals are oftenpoisons and may causebrain damage orillness.
Glue can also be made from rice or rice flour.