Writing
The invention of the first writing systems is roughly contemporary with the beginning of the Bronze Age of the late 4th millennium BC. The Sumerian archaic cuneiform script and the Egyptian hieroglyphs are generally considered the earliest writing systems, both emerging out of their ancestral proto-literate symbol systems from 3400 to 3200 BC with earliest coherent texts from about 2600 BC. It is generally agreed that Sumerian writing was an independent invention; however, it is debated whether Egyptian writing was developed completely independently of Sumerian, or was a case of cultural diffusion.
Neolithic signs in China
The Chengziya site in Longshan, Shandong has produced fragments of inscribed bones presumably used to divine the future, dating to 2500–1900 BC, and symbols on pottery vessels from Dinggong are thought by some scholars to be an early form of writing. Again, this is controversial. Symbols of a similar nature have also been found on pottery shards from the Liangzhu culture of the lower Yangtze valley.