TED is a nonprofit devoted to ideas worth spreading. Started as a four-day conference in California 25 years ago, TED has grown to support world-changing ideas with multiple initiatives. The annual TED Conference invites the world's leading thinkers and doers to speak for 18 minutes. Their talks are then made available, free, at http://www.ted.com. TED speakers have included Bill Gates, Al Gore, Jane Goodall, Elizabeth Gilbert, Sir Richard Branson, Nandan Nilekani, Philippe Starck, Ngozi Okonjo-Iweala, Isabel Allende and former UK Prime Minister Gordon Brown.
TED's media initiatives include http://www.ted.com, where new TEDTalks are posted daily. It includes the recently launched TED-Ed platform for students and educators, the Open Translation Project, which provides subtitles and interactive transcripts as well as the ability for any TEDTalk to be translated by volunteers worldwide, and TEDBooks, short e-books by speakers that elaborate on a single idea originally presented on TED's stage.