The people qualified and willing to go on long distance missions formed a strange sodality out of time, a troop of intellectual hunters and gatherers.… Their lives consisted of fragments snatched from other people's histories, separated by long gaps of travel. Over and over, they outlived all they knew... Each time they leaped off into the void it was an exercise in faith.
Printing is the next step in writing, but it shows up so much later after writing in China and Europe. However, an earlier form of stamps and clay printing was discovered on a 1700BC artifact called the Phaistos Disc. Still, why wasn't printing created in Mesopotamia and Mexico when writing kicked off? Why so late?