Bronze Age
Bronze Age cultures differed in their development of the first writing. According to archaeological evidence, cultures in Mesopotamia (cuneiform script) and Egypt (hieroglyphs) developed the earliest viable writing systems.
The overall period is characterized by widespread use of bronze, though the place and time of the introduction and development of bronze technology were not universally synchronous. Human-made tin bronze technology requires set production techniques. Tin must be mined (mainly as the tin ore cassiterite) and smelted separately, then added to molten copper to make bronze alloy. The Bronze Age was a time of extensive use of metals and of developing trade networks (See "Tin sources and trade in ancient times"). A 2013 report suggests that the earliest tin-alloy bronze dates to the mid-5th millennium BC in a Vinča culture site in Pločnik (Serbia), although this culture is not conventionally considered part of the Bronze Age. The dating of the foil has been disputed.
History of libraries
The first libraries consisted of archives of the earliest form of writing – the clay tablets in cuneiform script discovered in temple rooms in Sumer, some dating back to 2600 BC. About an inch thick, tablets came in various shapes and sizes. Mud like clay was placed in the wooden frames, and the surface was smoothed for writing and allowed to dry until damp. After being inscribed, the clay dried in the sun, or for a harder finish, was baked in a kiln. For storage, tablets could be stacked on edge, side by side, the contents described by a title written on the edge that faced out and was readily seen. The first libraries appeared five thousand years ago in Southwest Asia's Fertile Crescent, the area that ran from Mesopotamia to the Nile in Africa. Known as the cradle of civilization, the Fertile Crescent was the birthplace of writing, sometime before three thousand BC. (Murray, Stuart A.P.) These archives, which mainly consisted of the records of commercial transactions or inventories, mark the end of prehistory and the start of history.