Did you know that until the 17th century, glass was not used in windows? These days, it is hard to imagine a home without glass windows, but for centuries, that was the reality people lived in. Windows, however, are just one of the many glass elements people are used to using each day. We also drink our beverages from vessels made out of glass. We look into glass mirrors, and we use glass thermometers to take our temperature. Not to mention, glass sculptures decorate our homes and museums. Glass is truly a remarkable and versatile substance, and we have written many articles about it on this website.