| Hint | Answer | % Correct |
|---|---|---|
| ~9000 BC | Copper | 100%
|
| ~7000 BC | Lead | 87%
|
| Before 6000 BC | Gold | 80%
|
| ~5000 BC | Iron | 80%
|
| ~5000 BC | Silver | 73%
|
| ~3500 BC | Tin | 67%
|
| ~1500 BC | Mercury | 47%
|
| ~3750 BC | Carbon | 40%
|
| Before 1000 BC | Zinc | 33%
|
| 600 BC-200 AD | Platinum | 27%
|
| Before 2000 BC | Sulfur | 20%
|