| Clue | Source | Date |
|---|---|---|
| Paleolithic innovation | The Washington Post | 30 Apr 2022 |
| Paleolithic innovation | LA Times Daily | 30 Apr 2022 |
| Implement associated with its own age | LA Times Daily | 13 Feb 2021 |
| Implement associated with its own age | The Washington Post | 13 Feb 2021 |
| Implement for a Neanderthal | New York Times | 03 Dec 2018 |
| Paleolith, e.g | New York Times | 28 Apr 2018 |
| Paleolith, e.g. | ||
| Implement for a Neanderthal | ||
| Paleolith | New York Times | 15 Oct 2017 |
| Paleolith | ||
| Eolith or neolith | ||
| Paleolithic hammer or ax |