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.
Bioactive Glass was invented by Dr. Larry Hench back in 1970âs and was first commercialized for dental use in 1993. Over 100,000 cases have been performed using PerioGlas indicative of its safety and efficacy. Back in the 90âs there was a significant interest in periodontal regeneration.