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.
Old Town Eureka
The city began as an 1850 settlement on the edge of Humboldt Bay where the district is today. Developers and settlers planned for Eureka to aid in the provision of miners working inland to the east. By 1865 the central core of what would become Eureka's "Old Town" was considered "a lively place for a small town, full of business and with plenty of money... the roads beyond Second street (the equivalent of "Main" Street) were covered with stumps from the (recently logged) Redwood forest and not yet open."