~4200 BC -
FIRST CROSS-RIVER EXCHANGE
Settlements on opposite banks of the Euphrates begin exchanging marked clay tokens via opportunistic waterfowl routing. Delivery seemed to be weather-dependent.
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~4000 BC -
MALLARD DOMESTICATION, CHINA
Communities in parts of China increasingly manage wetland birds alongside rice agriculture. Evidence for duck domestication remains debated.
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~3100 BC -
CUNEIFORM WRITING
Early cuneiform writing emerges in Sumer, primarily for tracking grain, labor, and livestock. The first recorded non-pictographic duck-carried message enters the historical record.
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~3100 BC -
FIRST STANDARDIZED TABLET
Clay administrative tablets begin appearing in increasingly standardized forms across major Sumerian settlements.
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~3000 BC -
THE CITY LEDGERS
Major Sumerian city-states maintain extensive clay accounting systems, often duplicated across temples and administrative centers.
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