Strange quark
The first strange particle (a particle containing a strange quark) was discovered in 1947 (kaons), but the existence of the strange quark itself (and that of the up and down quarks) was only postulated in 1964 by Murray Gell-Mann and George Zweig to explain the Eightfold Way classification scheme of hadrons. The first evidence for the existence of quarks came in 1968, in deep inelastic scattering experiments at the Stanford Linear Accelerator Center. These experiments confirmed the existence of up and down quarks, and by extension, strange quarks, as they were required to explain the Eightfold Way.
Quark (dairy product)
The word "Quark" (Late Middle High German: "quarc", "twarc", "zwarg"; Lower Saxon: "dwarg"), with usage in German documented since the 14th century, is thought to derive from a West Slavic equivalent, such as Lower Sorbian "twarog", Upper Sorbian "twaroh", Polish "twaróg", Czech and Slovak "tvaroh", and is also cognate with Russian "tvorog" (), Bulgarian "tvarog" () and Belarusian: "tvarog" (тварог).