The Internet Archive aspires to "collect all the books, music and video that has ever been produced by humans," according to Brewster Kahle, who founded the site in 1996. The site has digitized millions of books and endeavored to collect everything published on every Web page for the last 15 years. It has also collected all news produced since 2009 by 20 different TV channels, including CBS, Comedy Central, Fox News, NBC News, PBS and Telemundo. It spans 1,000 news series that have generated more than 350,000 separate news programs. All material on the site is available for free, and new material is added about 24 hours after it was first broadcast. To search the TV archive, enter a search term and choose a specific time frame; the site will then look for the requested information using the closed-captioned words that have accompanied the news programs.