Inventions: 2nd millennium BC (2000 BC to 1000 BC)

The 2nd millennium BC spans the transition from the Middle to the Late Bronze Age, then to the Iron Age. Invention of Chariot, development in alphabets, use of Iron and Steel are notable in this period of time.

Year	Invention	Remarks
1900 BC	Iron	in Anatolia or Caucasus (modern Turky), Iron smelting and smithing techniques
1800 BC	Permanent Dyes	for cloths from a marine snail
1750 BC	Formal Medicine	in Babylonia, formalized its study and practice
1700 BC	Alphabets	in Phoenicia - Ugarit (modern Syria), simplified learning to write
1600 BC	Rubber	in Mesoamerica, from a tree sap
1500 BC	Kiln Fired Bricks	in Mesopotamia for stronger buildings
1400 BC	Chariot	in Egypt, by the invading Hyksos (Asian nomads)
1400 BC	Steel	in Hittite (modern Turkey), adding carbon to iron
1400 BC	Brush	in Egypt, using hogs hair later horse hair
1200 BC	Metal Swords	in Egypt
1150 BC	Topographic Maps	in Egypt
1000 BC	Coins	in China

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