Related Clues:
- ''What's the bright ___?''
- Asset for an entrepreneur
- Result of cogitating, perhaps
- Piece of mind?
- Heartbreak
- Seed of invention
- What may come to mind
- Just think of it
- Word in a Charlie Brown phrase
- Prelude to a solution
- Brainy inspiration
- It may come to a head
- ''What's the big ___?''
- Genesis of an invention
- Inventor's flash