Possible Clues:

• Brilliant discovery announced by Archimedes
• Word on the California state seal
• A brilliant discovery! Brussels are amazingly full of potassium
• "That's it!"
• Announcement of maths discovery that went with a splash?
• Cry of triumph (at a discovery)
• Greek cry of discovery by Archimedes
• (Greek) cry of discovery
• Shout of 'Mistake!' rued - retracted in part
• 'I got it!'