repetitive - definition and synonyms. What are red words? 90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
Quark is a traditional, creamy, vegetarian, unripened cheese tracing its origin to German-speaking and eastern European countries. It is known by many names, chief among them being ÑÐ²Ð¾ÑÐ¾Ð³ in Russian, tvaroh in Czech and Slovak, topfen in Austria, kwark in Dutch, kvark in Denmark and kvarg in Norway and Sweden.
Only the up and down quarks are needed to make protons and neutrons; the others occur in heavier, unstable particles. Quarks are any of a group of subatomic particles thought to be among the fundamental constituents of matter more specifically, of protons and neutrons. <br /> The concept of the quark was first proposed by Murray Gell-Mann and George Zweig ; its name was taken from James Joyce's novel Finnegans Wake.