The ancient Sumerians... lived in the southern part of what is now Iraq. The heartland of Sumer lay between the Euphrates and Tigris rivers, in what the Greeks later called Mesopotamia. This territory,
skillfully irrigated, proved very fertile, and major cities has long been in existence... Well before 3001
B. C., Sumerians were recording their language using simple pictures. They wrote on tablets of clay, I
evolving the script that to us is known as cuneiform.
- Explore World Cultures: Sumerians, from the British Museum digital reso
According to the passage above, what unique contribution did the Sumerians make to fut
cultures?