Gauge boson certain atoms. The Standard Model of particle physics recognizes four kinds of gauge bosons: photons, which carry the electromagnetic interaction; W and Z bosons, which carry the weak interaction; and gluons, which carry the strong interaction. Isolated gluons do not occur because they are color-charged and subject to color confinement. In a quantized gauge theory, gauge bosons are quanta of the gauge fields. Consequently, there are as many gauge bosons as there are generators of the gauge field. In quantum electrodynamics, the gauge group is "U"(1); in this simple case, there is only one gauge boson. In quantum chromodynamics, the
3 Quarks Daily had reached thirty-five thousand. Since then, "3 Quarks Daily" has culled content from hundreds of sources, from blogs such as Salon, Science Daily, and The Huffington Post, from major publications such as "The New York Times", "Nature", and "The Guardian", to smaller outlets such as "Guernica Magazine", "The Awl", and "The American Scholar". The name "3 Quarks Daily" comes from the elementary nuclear particles of physics which in turn were named after the word "quark" which James Joyce had used in Finnegans Wake. The confluence of references to both science and literature in a single word suited the intent of