| Clue | Source | Date |
|---|---|---|
| Alleged causes of mental blocks? | Universal | 24 Jan 2026 |
| Stereotypical headwear for conspiracy theorists | ||
| Pieces of headwear that might protect against mind reading (but probably not) | Universal | 17 Sep 2022 |
| Shields against mind control, some believe | Wall Street Journal | 20 Jul 2021 |