Inventions: 3000 BC to 2000 BC

The 3rd millennium BC spans from the Early to the Middle Bronze Age, during this period of time, the imperialism and the desire to conquer grew to prominence in the city states of the Middle East, Eurasia, etc. Also Ancient Egypt was in the peak of its civilization.

Year	Invention	Remarks
2900 BC	Pyramid	in Egypt
2800 BC	Soap	in Mesopotamia
2800 BC	Sickle	in Sumeria
2630 - 2611 BC	Step pyramid	in Imhotep (Egypt)
2600 BC	Papyrus, Suture, Pharmaceutical cream	in Imhotep (Egypt)
2600 BC	Rope	in China
2600 BC	Mummification	in Egypt
2600 BC	Sewage system, Toilet	Indus Valley Civilization
2500 BC	Flush toilet, Arch	Indus Valley Civilization (Arch in Mohenjo-daro)
2500 BC	Schools	in Sumeria
2400 BC	Shipyard	in Lothal (Indus Valley Civilization)
2000 BC	Wooden Locks	in Egypt
2000 BC	Underwater Tunnel	in Babylonia under the river Euphrates (modern Iraq) connecting king's palace with temple

Inventions: 5000 BC to 3000 BC

The 4th Millennium BC marks the beginning of the Bronze age and Writing. This period also witnessed the inventions of Silk, Plywood, Comb, Noodle, Boats etc.

Year	Invention	Remarks
4500 BC	City States and Nations	Mesopotamia, Indus Valley, Egypt, Yellow River civilisation
4500 BC	Musical Instruments	in Europe, Mesopotamia pipes made of bone, stringed harp
4500 BC	Metalwork	in Egypt
4000 BC	Bridges	in Africa
4000 BC	Cosmetics, Fragrances	in Egypt
4000 BC	Arithmatic	in Mesopotamia by the Sumerians
4000 BC	Canal	in Mesopotamia
4000 BC	Stone paved street	in Ur (Iraq)
3807 BC	Timber Engineered roadway	in England
3500 BC	The Wheel / Carts	by Sumerians
3500 BC	Water Clock	by Sumerians
3500 BC	Writing	by Sumerians
3500 BC	Sail Powered Boats	in Egypt (used on the Nile river)
3200 BC	Silk	in China (they developed the silk fabrics as early as 6000 BC)
3100 BC	Drainage	in the Indus Valley Civilization
3000 BC	Bronze	in Mesopotamia
3000 BC	Potter's Wheel	in Mesopotamia
3000 BC	Sundial (Gnomon)	in Egypt
3000 BC	Glass	in Middle East