| Clue | Source | Date |
|---|---|---|
| They'll help you on a trip down memory lane? | The Atlantic | 19 Jul 2026 |
| Drill bits? | Newsday | 22 Nov 2025 |
| Studying set | USA Today | 07 May 2020 |
| Memorization aids | USA Today | 01 Apr 2020 |
| Way to learn your fireworks? | ||
| Arithmetic-practice aid | ||
| Learning method |