Inventions, Discoveries, Introductions
- The Chinese first produce Paper.
- Silk Road between Europe and Asia
- Hipparchus discovers precession of Earth's equinoxes and compiles first trigonometric tables
- Liu An invented tofu
- The Roman concrete (pozzolana) first used
- Rotary mill invented by the ancient Greeks
- A system for sending signs to communicate quickly over a long distance is described by Polybios
- The earliest known winnowing machine is depicted in a Han Dynasty Chinese tomb model.
Read more about this topic: 2nd Century BC