The designation “glass” is commonly used to describe a transparent and brittle solid made mainly of silica like windows or jar. However, the word “glass” has a larger meaning in science. Whereas a crystal has a 3-­‐dimensional translational order a glass as it was seen 50 years ago lacks this 3-­‐dimensional order and has an amorphous structure. In the last decades, glass also started to describe solids, which may have a translational order but differ from...