The concept of zero was first developed in India around the 5th century BCE.

The Code of Hammurabi was written in ancient Mesopotamia around 1750 BCE.

The Egyptians developed a system of writing based on hieroglyphs around 3000 BCE.

The Great Wall of China was built by the Chinese over a period of centuries, beginning in the 7th century BCE.

The Mesopotamians developed a system of mathematics based on the number 60 around 3500 BCE.

The pyramids of Giza were built by the Egyptians around 2500 BCE.

The Mesopotamians developed a system of irrigation that allowed them to grow crops in the desert around 3500 BCE.

The Mesopotamians developed a system of writing based on cuneiform around 3500 BCE.

The Mesopotamians developed a system of astronomy that allowed them to predict the movements of the stars and planets around 3500 BCE.

The Egyptians developed a system of medicine that included surgery and the use of herbs around 3000 BCE.

The Mesopotamians developed a system of government that included a king and a council of advisors around 3500 BCE.

The Mesopotamians developed a system of trade that included the use of money around 3500 BCE.

The Mesopotamians developed a system of education that included schools and universities around 3500 BCE.

The Mesopotamians developed a system of art and literature that included painting, sculpture, and poetry around 3500 BCE.

The Mesopotamians developed a system of music that included the use of instruments and vocal music around 3500 BCE.