From a section of the Wikipedia article on Conservapedia:
In April 2007, Peter Lipson, a doctor of internal medicine, repeatedly attempted to edit Conservapedia's article on breast cancer to include evidence arguing against Conservapedia's claim that abortion was a major cause of the disease. Conservapedia administrators "questioned his credentials and shut off debate". Several editors whose accounts were blocked by Conservapedia administrators, including Lipson, started another website, RationalWiki, a sometimes satirical and sometimes serious wiki website with articles written from a secular, progressive perspective.[?] RationalWiki's self-stated purpose is to analyze and refute "pseudoscience", the "anti-science movement", and "crank ideas", as well as to conduct "explorations of authoritarianism and fundamentalism" and explore "how these subjects are handled in the media."
Conservapedia: page deleted 3 times from 2007-2008 (see Conservapedia/censorship)