The first writing is a receipt
The earliest CUNEIFORM TABLETs are not poems or prayers. They are accounts: so many jars of oil, so many sheep, so many bushels of barley, with a mark for the official responsible. WRITING appears to have been invented by people who needed to keep track of stock they could not personally see.
It grew out of a physical system that came first. For thousands of years, goods were tracked with small CLAY tokens — a cone for a measure of grain, a disc for a sheep — sealed inside a clay ball so nobody could add or remove any. Someone then started pressing the tokens into the outside of the ball to record what was inside, at which point the marks were doing the job and the tokens were redundant. Literature arrives centuries later, riding on a stocktaking tool.
Hammurabi's laws were carved in public
HAMMURABI's code, cut into a two-metre stone pillar around 1750 BC, lists 282 rulings — and the significance is less the content than the placement. It stood where people could see it, which meant the law existed independently of whoever was judging you, and could in principle be checked.
The rulings themselves are unsentimental and unequal. Penalties scale by class: injuring a noble costs far more than injuring a commoner, and injuring an enslaved person is treated as property damage. There is an eye for an eye, but there is also a presumption of innocence, a requirement for evidence, and — unexpectedly — rules capping interest rates, setting builders' liability for houses that collapse, and guaranteeing a surgeon's fee alongside the punishment for botching the operation.
Cities happened because the rivers were difficult
Southern Mesopotamia has rich soil and almost no rain. The TIGRIS and EUPHRATES flood unpredictably, in spring, after the crops most want water — the opposite of the Nile's obliging annual schedule. FARMING there only works if you build and maintain CANAL networks, and that is a job no household can do alone.
So the CITY is partly an answer to an irrigation problem. Uruk may have reached 40,000 people by around 3000 BC, at a time when nowhere else on Earth had anything comparable. Coordinating the canals, storing the surplus, and settling the resulting arguments produced administrators, priests, a KING, and eventually TRADE reaching to the Indus valley — because the plain has grain but no stone, no timber and no metal for BRONZE, all of which had to be brought in.
Why we count in sixties
Sixty seconds, sixty minutes, 360 degrees. That is Babylonian, and it has survived every attempt at decimalisation, including the French Revolution's decimal clock. Sixty divides cleanly by two, three, four, five, six, ten, twelve, fifteen, twenty and thirty, which makes fractions manageable without decimal notation.
BABYLON's astronomers used it to predict eclipses and track planets with real accuracy, keeping records over centuries. The rest of the grid holds the world they built it in: SUMER, AKKAD and ASSYRIA, the stepped ZIGGURAT with its TEMPLE on top, the EMPIRE that rose and fell repeatedly across the same plain, and the WHEEL — which turns up here first as a potter's wheel before anyone thought of putting one under a cart.