Eureka (word)
The exclamation 'Eureka!' is attributed to the ancient Greek scholar Archimedes. He reportedly proclaimed "Eureka! Eureka!" after he had stepped into a bath and noticed that the water level rose, whereupon he suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. (This relation is "not" what is known as Archimedes' principle—that deals with the "upthrust" experienced by a body immersed in a fluid.) He then realized that the volume of irregular objects could be measured with precision, a previously intractable problem. He is said to have been so eager to share his discovery that he leapt out of his bathtub and ran naked through the streets of Syracuse.
Graea
If men from Oropos-Graia were among the early Greek visitors to Capua or Veii and even early Rome, we can better understand an age-old puzzle: why Greeks were called "Greeks" in the Latin West. Such people told their first contacts in the Latin region that they were "Graikoi," that is, people from Graia. They were thus called "Graeci" by the people whom they met.
The ethnonym comes from the adjective γραῖα "graia" "old woman", derived from the PIE root "*ǵerh-/*ǵreh-", "to grow old" via Proto-Greek "*gera-/grau-iu"; the same root later gave γέρας "geras" (/keras/), "gift of honour" in Mycenean Greek.