Level 17 Level 19
Level 18

Inventions


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Calendar
roughly 3500 BC
Egyptian hieroglyphs
roughly 3200 BC
Papyrus
roughly 3000 BC
Cuneiform script
roughly 3000 BC
Domestication of the horse
roughly 2000 BC
Alphabetic writing
19th century BC
Chariot
roughly 1800 BC
Chinese writing system
between 1600 and 1200 BC
Iron smelting
roughly 1400 BC
Mesoamerican scripts
roughly 600 BC
Democracy
508 BC
Coins
7th century BC