e close to one another, to produce trade, reducing the friction of space. This constituted a major step in human history.
             THE EARLY CITIES OF MESOPOTAMIA AND INDUS
             As for as it is know today the earliest cities took place in 3500BC in the eastern Mesopotamia; the valleys of the Tigris and the Euphrates. The city of TepeYahyâ was formed 5,500 years ago playing a key role in trade from Mesopotamia and India. It was located about 4,500 ft above see level in the Soghun Valley, 150 miles south of Kerman. There was a mount 60 ft high and 600 ft in diameter. (6) P.28 The city showed six occupation periods form the 5th millennium BC to about 400 AD. The city was has an unexplained gap in history for about 1000 years form 2000 BC to 1000BC, when it was taken over by people of the Iron age. (6) P.29
             There were three significant aspects to Tepe Yahyâ that made it stand out over other cities of its time. The first is its writing tablets recovered form one of the lower levels in the mount. They were made of clay and dated back to 3560
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