| − | '''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]]. | + | '''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]]. The first glue was made some time around 7000 years ago, by the Sumerians. |