When Naheed Nenshi spoke at TEDxCalgary, he was a university professor. Now, he’s the mayor of Calgary. In May of 2010, just a month after giving a TEDx talk, Nenshi launched a successful campaign for mayor—one dubbed the “purple revolution” because of his aim to bring together conservative red and liberal blue. He won the election by a c...

Amber Galloway-Gallego is a world-renowned ASL interpreter specializing in music.

Three-time Grammy-winning superstar Lizzo has become a household name, with more than four billion global streams and a Platinum debut album.

Dr. Chris Nowinski is leading a global conversation on concussions, CTE and the future of sports.

About this event: A livecast of TEDxChange 2013 (Seattle, Washington). The event is free to attend. No live speakers. TEDxChange TEDxChange is an event created out of a partnership between the Bill & Melinda Gates Foundation and the TEDx program. It is an initiative devoted to ideas worth spreading in the areas of global health and development. The TE...

Darren Walker is a leader in the nonprofit and philanthropic sectors.

TED.com video exists to celebrate great speakers, thinkers, doers -- people with ideas that are passionately held and clearly put. For our speakers, putting their videos online has, in many cases, amplified their work beyond imagination, provoking new connections and directions to their careers and even their lives. As we approached the f...

From tech to self-help via poetry, fiction and graphic novels, here are the books you need to read. What’s the one book you're always thrilled to discover that someone else has read? We posed that question to TED speakers -- and, well, they geeked out, offering us a list of hidden gems that wouldn’t typically crop up on a holiday shopping list....

After his mainstage talk on the opening night of TED, psychologist Steven Pinker sat down with Chris Anderson to dive into his new book, Enlightenment Now. The two examined some criticisms of the book and the thesis behind it, dug into the data, and then threw the floor open for questions, in a session that offered the luxury of time to real...

Do you have a TED Talk inside, just bursting to come out? Take this tongue-in-cheek musical journey to "Give Your Talk." A musical love letter to our speakers -- written, directed and performed by the TED staff.

In this funny (and actually poignant) 3-minute talk, social strategist Renny Gleeson breaks down our always-on social world -- where the experience we're having right now is less interesting than what we'll tweet about it later.

Dr. Seyi Oyesola takes a searing look at health care in underdeveloped countries. His photo tour of a Nigerian teaching hospital -- all low-tech hacks and donated supplies -- drives home the challenge of doing basic health care there.

Investor and prankster Yossi Vardi delivers a ballsy lecture on the dangers of blogging. Specifically, for men.

Economics writer Tim Harford studies complex systems -- and finds a surprising link among the successful ones: they were built through trial and error. In this sparkling talk from TEDGlobal 2011, he asks us to embrace our randomness and start making better mistakes.

TV executive Lauren Zalaznick thinks deeply about pop television. Sharing results of a bold study that tracks attitudes against TV ratings over five decades, she makes a case that television reflects who we truly are -- in ways we might not have expected.

Sebastian Wernicke thinks every TED Talk can be summarized in six words. In this talk, he shows how to do just that -- and less.

With all the intensity and brilliance for which he is known, Alan Kay envisions better techniques for teaching kids by using computers to illustrate experience in ways -– mathematically and scientifically -- that only computers can.

Louise Fresco shows us why we should celebrate mass-produced, supermarket-style white bread. She says environmentally sound mass production will feed the world, yet leave a role for small bakeries and traditional methods.

David McCandless turns complex data sets (like worldwide military spending, media buzz, Facebook status updates) into beautiful, simple diagrams that tease out unseen patterns and connections. Good design, he suggests, is the best way to navigate information glut -- and it may just change the way we see the world.