| Hint | Answer | % Correct |
|---|---|---|
| ~9000 BC | Copper | 100%
|
| ~7000 BC | Lead | 86%
|
| Before 6000 BC | Gold | 79%
|
| ~5000 BC | Iron | 79%
|
| ~5000 BC | Silver | 71%
|
| ~3500 BC | Tin | 64%
|
| ~3750 BC | Carbon | 43%
|
| ~1500 BC | Mercury | 43%
|
| Before 1000 BC | Zinc | 29%
|
| 600 BC-200 AD | Platinum | 21%
|
| Before 2000 BC | Sulfur | 21%
|