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.
Xueta
The Balearic word "xueta" derives, according to some experts, from "juetó", diminutive of "jueu" ("Jew") which give "xuetó", a term that also still survives. Other authors consider that it may derive from the word "xulla" (pronounced "xuia" or "xua," which means a type of salted bacon and, by extension, pork) and, according to popular belief, refers to Xuetes who were seen eating pork to show that they did not practice Judaism. But this etymology has also been linked with the tendency, present in various cultures, of using offensive names related to pork to designate Jews and Jewish converts (see, for example "Marrano"). A third possibility links both putative etymologies; the word "xuia" may have provoked the substitution of the "j" of "juetó" by the "x" of "xuetó", and "xueta" could have been imposed over "xuetó" by the greater phonetic resemblance with "xuia".