2nd Century BC - Inventions, Discoveries, Introductions

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.