Alternatives to general relativity are physical theories that attempt to describe the phenomena of gravitation in competition to Einstein's theory of general relativity. There have been many different attempts at constructing an ideal theory of gravity. These attempts can be split into four broad categories: Straightforward alternatives to general relativity (GR), such as the Cartan, Brans–Dicke and Rosen bimetric theories. Those that attempt to construct a quantized gravity theory such as loop quantum gravity. Those that attempt to unify gravity and other forces such as Kaluza–Klein. Those that...

In the context of the World Wide Web, a content farm (or content mill) is a company that employs large numbers of freelance writers to generate large amounts of textual content which is specifically designed to satisfy algorithms for maximal retrieval by automated search engines. Their main goal is to generate advertising revenue through attracting reader page views, as first exposed in the context of social spam. Articles in content farms have been found to contain identical passages across several media sources, leading to questions about the sites placing search engine optimization goals over...