glass was used to make knives and sharp weapons and was made from natural occurrences such as obsidian (glass from a volcano) this was the only way that people knew how to source glass until people started to discover different ways to hand make or make glass with machines. The discovery was thought to be made in Syria in 5000BC but archaeological evidence shows that glass was in fact first made in Egypt and Mesopotamia in 1500BC and along the coast of the Mediterranean Sea became the main source for glass.http://www.historyofglass.
com/glass is a translucent or transparent hard object that will break or crack if it is dropped and is often seen being used for windows or glass cups. It is made by
