Why is the development of writing the single most important product of this period?

Writing is one of the most important skills in almost of all countries. Since to write something is too natural for us, we do not think the usability; but for the ancient people, writing is not a basic skill. It is just for some educated people. This report shows the development of writing and why it is the most important product of early society.
Before the discovery of writing, there are a few ways to pass on the knowledge to the next generation, paintings or oral presentations. Paintings could include much information but not exact information, so it easily caused some misunderstanding. Oral presentation could have more particular information, however, the information could be added or modified by the teller. The information would be far and far different from original one if it had been passed for many people, so to convey same information to many people was very hard work for that people. This situation is also important for us, because to know the ancient knowledge that di...