In ancient times, small tablets made out of clay were used as a writing medium. From the 4th millennium BCE in the Sumerian, Babylonian, Assyrian and Hittite civilizations of the Mesopotamia region, cuneiform characters were imprinted on a wet clay tablet with a stylus often made of reed. Once written upon, many tablets were dried in the sun or air, remaining fragile. Later, these unfired clay tablets could be soaked in water and recycled into new clean tablets. Other tablets, once written, were grilled in a kennal or fired in kilns (or inadvertently, when buildings were burnt down by accident or during conflict) making them hard and durable. Collections of these clay documents made up the very first archives. They were at the root of first libraries. Tens of thousands of written tablets, including many fragments, have been found in the Middle East.
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