| Clue | Source | Date |
|---|---|---|
| *Workforce | The Washington Post | 17 Jan 2021 |
| *Workforce | LA Times Daily | 17 Jan 2021 |
| Should we work on the experiment or go for a swim? | LA Times Daily | 13 Dec 2018 |
| Should we work on the experiment or go for a swim? | The Washington Post | 13 Dec 2018 |
| Should we work on the experiment or go for a swim? | ||
| Choice of pH testing sites? | Wall Street Journal | 07 Jul 2016 |
| Potential employees | New York Times | 09 Oct 2015 |
| Potential employees |