| Clue | Source | Date |
|---|---|---|
| White residue on a blackboard | ||
| Powder in an old chemistry classroom? | Universal | 29 Feb 2024 |
| Powder on a gymnast's uniform | LA Times Daily | 08 Aug 2023 |
| School board output? | ||
| Classroom sneeze elicitor | ||
| Blackboard eraser emanation | ||
| Blackboard eraser emanation |