query: When was glass first created?
passage: History of glass
The history of glass-making dates back to at least 3600 years ago in Mesopotamia. However, they may have been producing second-rate copies of glass objects from Egypt, where this complex craft originated.[1] Other archaeological evidence suggests that the first true glass was made in coastal north Syria, Mesopotamia or Egypt.[2] The earliest known glass objects, of the mid second millennium BC, were beads, perhaps initially created as the accidental by-products of metal-working (slags) or during the production of faience, a pre-glass vitreous material made by a process similar to glazing.[n 1] Glass products remained a luxury until the disasters that overtook the late Bronze Age civilizations seemingly brought glass-making to a halt.
passage: Medieval technology
The first mention of a "glass" mirror is in 1180 by Alexander Neckham who said "Take away the lead which is behind the glass and there will be no image of the one looking in."