law of diminishing returns. A concept in economics that if one factor of production (number of workers, for example) is increased while other factors (machines and workspace, for example) are held constant, the output per unit of the variable factor will eventually diminish.
History of glass. The history of glassmaking can be traced back to 3500 BCE in Mesopotamia, but Mesopotamians may have created second-rate copies of glass objects from Egypt, where this complex craft actually originated. Other archaeological evidence suggests that the first true glass was made in coastal north Syria, Mesopotamia or Egypt.
We donât know when, where or how the first synthetic glass was made, or who invented it. Someone probably invented it by accident. As far as we know, the ancient Egyptians and Mesopotamians were the first to use it, as glass beads for jewellery, around 2500 BC.