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.
Horilka
The word comes from the same root as the verb "hority", ‘to burn’, similarly to Belarusian "harelka", south Russian "gorelka", Czech "kořalka", and Slovak "goralka", "goržolka". It is considered to have come about following the Polish example "gorzałka", possibly as an abbreviation of a compound word like "horile vyno" (‘burning wine’; compare the older word "horěloe vyno", горѣлое вино, attested in 1511) or "horila(ya) voda" (‘burning water’; compare early Czech "pálená voda" → "pálenka" or Hungarian/Transylvanian "palinka"). It may be an adaptation of the early Old High German "der brannte Wein" → "Branntwein". Also compare English "brandy", short for "brandywine", from Dutch "brandewijn", ‘burning wine’.