3000 BCE – 500

Ancient

7 landmarks in this edition

1. 

   c. 3500 BCE · MechanicsWheel and axle

2. 

   c. 3300 BCE · ChemicalsBronze smelting

3. 

   c. 3200 BCE · CommunicationsWriting

4. 

   by 3000 BCE · TransportationSail and hull

5. 

   c. 1200 BCE (iron); 1856 (Bessemer steel) · ChemicalsIron and steel

6. 

   c. 260 BCE (described) · MechanicsLever, pulley, and screw

7. 

   105 CE (imperial report); earlier Chinese use · CommunicationsPaper