<Ul> <Li> c. 3500 BC: Writing systems </Li> <Li> c. 3000 BC: Mummification </Li> <Li> c. 3000 BC: Papyrus </Li> <Li> c. 3000 BC: Ard plough </Li> <Li> c. 3000 BC: Wheel </Li> <Li> c. 3000 BC: Glass making </Li> <Li> c. 3000 BC: Galley </Li> <Li> c. 3000 BC: Pottery </Li> <Li> c. 2800 BC: Metallurgy / Bronze forging </Li> <Li> c. 2700 BC: Plumbing </Li> <Li> c. 2500 BC: Abacus </Li> <Li> c. 2000 BC: Iron Smelting </Li> <Li> 2nd millennium BC: Arch </Li> <Li> c. 1700 BC: Alphabet </Li> <Li> c. 1500 BC: Glass making </Li> <Li> c. 11th century BC: Steel </Li> <Li> c. 800 BC: Saddle </Li> <Li> c. 710 BC: Lock </Li> <Li> c. 600 BC: Aqueduct </Li> <Li> c. 600 BC: Archimedes' screw </Li> <Li> 6th century BC: Caliper </Li> <Li> c. 515 BC: Crane </Li> <Li> c. 325 BC: Odometer </Li> <Li> 3rd century BC: Watermill </Li> <Li> c. 200 - 300 BC: Block and tackle </Li> <Li> c. 100 - 500 BC: Horseshoe </Li> <Li> c. 100 BC: Paper </Li> <Li> 50 AD: Aeolipile </Li> </Ul> <Li> c. 3500 BC: Writing systems </Li> <Li> c. 3000 BC: Mummification </Li> <Li> c. 3000 BC: Papyrus </Li>

What major innovations in making tools and weapons occurred between 4000 bc and 1000 bc