Quark: an elementary particle and a fundamental constituent of matter. (Wiki) They combine to form hadrons such as protons and neutrons (components of atomic nuclei).The six different types are called flavors: up, down, strange, charm, bottom, and top. What is this? Physics or the Kama Sutra? But seriously though, a quark is also a character from Star Trek and a dairy product. Who knew? What Q-word did you pick to blog about?