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.
Birka
Both Rimbert and Adam were German clergymen writing in Latin. There are no known Norse sources mentioning the name of the settlement, or even the settlement itself, and the original Norse name of Birka is unknown. "Birca" is the Latinised form given in the sources and "Birka" its contemporary, unhistorical Swedish form. The Latin name is probably derived from an Old Norse word "birk" which probably meant a market place. Related to this was the "Bjärköa law" (bjärköarätt) which regulated the life on market places in Denmark, Norway and Sweden. Both terms in different forms are very common in Scandinavian place names still today leading to speculation that all references to Birca especially by Adam of Bremen were not about the same location.