Related Clues:
- It's explosive
- ...
- Start of an invention
- Explosive
- Inventor's ''step one''
- Bright one from gray matter
- It might make molehills out of mountains
- Blast source
- Inventor's start
- Wrecking ball alternative
- Light bulb's signification, in cartoons
- Light bulb, in comics
- Mental glimmer
- Object of thought
- Head piece?