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.
Priestley was able to create carbonated water by placing a bowl of water over a beer vat, which soon caused the air to collect over the fermenting beer. Was invented in 1767 by Joseph Priestley. the man behind carbonated water Known today as club soda, soda water, sparkling water, seltzer water, or fizzy water Is made by fusing carbon dioxide with water.