2. The plow: The plow was invented in Sumer around 3000 BC. It was used to turn the soil and prepare it for planting. Today, the plow is still used for the same purpose in agriculture.
3. The sail: The sail was invented in Sumer around 3000 BC. It was used to harness the power of the wind to propel boats. Today, sails are still used on sailboats and ships.
4. Writing: The Sumerians developed the first system of writing, called cuneiform, around 3500 BC. Cuneiform was used to write down laws, stories, and other important information. Today, writing is used for a wide variety of purposes, including communication, education, and record-keeping.