Related Clues:

• Invention's origin
• Think about it
• Flash of brilliance, perhaps
• Start of a solution
• Inventor's ''light bulb''
• It might be bright
• It precedes an invention
• Genesis of many great inventions
• Gray cells' product
• Brainstorm result
• Theory, e.g.
• It may be half-baked
• Start of a novel?
• It could be a very good thought
• It may be kicked around