| Clue | Source | Date |
|---|---|---|
| In 1968, Spencer Silver at 3M Corporation was attempting to develop a superstrong adhesive ... | New York Times | 11 Mar 2026 |
| Sticky yellow squares ... or a description of the circled letters and what they follow? | New York Times | 22 Jul 2024 |
| They get the memo | ||
| Sticky yellow squares | ||
| Stick-ons | ||
| Stick-ums |