Scientists have argued about the Sumerians for many years. The flourishing of this civilization was about 6 thousand years ago. These people had amazing techniques and knowledge for that period. This civilization appeared suddenly and also disappeared.
Another 4 thousand years BC. they understood philosophy, were active in trade and had a developed, by our standards, state with a bicameral government, when at that time tribal system reigned on most of the planet.
Their hieroglyphs, deciphered by scientists, showed that they worked on the ground, were engaged in weaving and knew about the wheel. They also worked in the metallurgical and scientific fields, and also had a sewer system, which began to appear in the rest of the world at the end of the Middle Ages.
In addition, the calendar belongs to their inventions. The Sumerians set the length of the year, months, weeks and days. Despite this, the hieroglyphs did not answer the key question: what is the origin of this civilization.