| Associated People/Civilization (Year) | Innovation | Hint |
| Homo Habilis (2.5 million years ago) | |
| Homo Erectus (1.6 million years ago) | |
| Fertile Crescent (8,000 BCE) | |
| Sumer, Mesopotamia (3,000 BCE) | |
| Egypt (3rd millenium BCE) | |
| Hittites (14th century BCE) | |
| Assyria (9th century BCE) | |
| | Associated People/Civilization (Year) | Innovation | Hint |
| Han Dynasty (105 CE) | |
| China (5th century CE) | |
| Central Asian Nomads (by 8th century CE) | |
| China (1040 CE) | |
| Medieval Europe (1100s CE) | |
| Medieval France (late 1100s CE) | |
| England (1300s CE) | |
|