LIGHTBULB
| Date | Clue |
|---|---|
| 2020-10-19 | Idea, in the comics |
| 2018-10-12 | Item suggested visually by the black squares in this puzzle's grid |
| 2018-08-08 | *Thomas Edison and Joseph Swan |
| Date | Clue |
|---|---|
| 2020-10-19 | Idea, in the comics |
| 2018-10-12 | Item suggested visually by the black squares in this puzzle's grid |
| 2018-08-08 | *Thomas Edison and Joseph Swan |