Eureka! I have found it! — Archimedes

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Eureka! I have found it! — Archimedes · Smartyfair

Eureka! I have found it!

Source foundCuriosity

In plain words

Eureka is the happy shout for the moment you finally figure something out. Archimedes was so happy he shouted it twice.

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How sure this is: 88% sureThese words were traced back to where they first appeared. That source is listed below.
What turned up: Reported by Vitruvius, De Architectura, Book IX, introduction (c. 25 BC); Greek 'heureka', trans. M. H. Morgan (1914). Anecdotal report about two centuries after his death.
Work: reported by Vitruvius, De Architectura, Book IX (c. 25 BC); trans. M. H. Morgan, 1914
Occasion: c. 250 BC · Syracuse, Sicily · leaping from his bath, having just seen how rising water could test King Hiero's gold crown
Sources checked: en.wikisource.orgChecked using claude-fable-5, 22 August 2026Morgan translation read this pass: leaping from his bath he 'shouted repeatedly in Greek, Eureka, eureka' on seeing the water-displacement answer to Hiero's crown. Text = standard English rendering of the doubled Greek (transliteration + literal translation, nothing added).