Supposedly, Archimedes was so thrilled and excited with this discovery that he immediately hopped out of the bath and ran onto the streets to tell the king, shouting loudly 'Eureka! Eureka!'

Who first said Eureka and why?

Archimedes has gone down in history as the guy who ran naked through the streets of Syracuse shouting "Eureka!" — or "I have it!" in Greek. The story behind that event was that Archimedes was charged with proving that a new crown made for Hieron, the king of Syracuse, was not pure gold as the goldsmith had claimed.

Did Einstein say Eureka?

Another famous eureka moment belongs to none other than Albert Einstein. ... Einstein didn't come up with the whole thing in an instant, struck by mathematical equations in the patent office. He was, more believably, struck by a simple notion that was powerful because of how he considered it.