Glass is one of the most important discoveries of mankind. Originally used as a cutting tool, it has been around for about 75,000 years. The first records of glass making, however, date back to the Egyptian and Mesopotamian. Since then, the mastery of the manufacturing technique has been developing in different civilizations and nations until the Industrial Revolution popularized the material and allowed its production on a large scale. In architecture, glass was first used as a sealing element around 100 AD.