The Sumerians developed the first writing system known as cuneiform using wedge-shaped symbols pressed into clay tablets. They used writing to keep business records and later wrote down stories, poetry, and songs. Some of their most notable achievements included inventing the wheel for carts and wagons, developing a base-60 number system, and constructing massive zigurrat temples. The Sumerians made advances in fields such as math, science, architecture, art, and music.