WikiHow is an exciting new "collaborative writing project aiming to build the world's largest how-to manual." Applying the wiki model of information collection (see also NSDL Scout Report for Mathematics, Engineering and Technology, November 5, 2004), wikiHow contains instructions on how to do thousands of things, all written by individuals in the wikiHow community. Anyone is invited to join the community by contributing a new page or editing a page that someone else started. The quality of the entries are improved over time as people make changes and remove "vandalism, nonsense, and material not fit for the wikiHow site." WikiHow is sustained by funds gained through "tasteful, non-obnoxious advertising on the website" and is powered by open source software created by the WikiMedia Foundation. Visitors can search the how-to articles or browse by topic, which range from auto repair to removing salt buildup on zipper.