TED is a nonprofit devoted to spreading ideas, usually in the form of short, powerful talks. TED began in 1984 as a conference where Technology, Entertainment and Design converged, and today covers almost all topics — from science to business to global issues — in more than 100 languages. TED is a global community, welcoming people from every discipline and culture who seek a deeper understanding of the world. Their main agenda is to make great ideas accessible and spark conversation.
https://www.ted.com/ is a clearinghouse of free knowledge from the world’s most inspired thinkers.