TEDTalks (video)

Activist Caroline Casey tells the story of her extraordinary life, starting with a revelation (no spoilers). In a talk that challenges perceptions, Casey asks us all to move beyond the limits we may think we have.

The nerve disease ALS left graffiti artist TEMPT paralyzed from head to toe, forced to communicate blink by blink. In a remarkable talk at TEDActive, entrepreneur Mick Ebeling shares how he and a team of collaborators built an open-source invention that gave the artist -- and gives others in his circumstance -- the means to make art again.

Much of the TV, video, film and sport we watch is sponsored by a brand, a product, a corporation. But ... why? With humor and persistence, filmmaker Morgan Spurlock dives into the hidden but influential world of brand marketing, on his quest to make a completely sponsored film about sponsorship. And yes, this talk was sponsored too. By whom and for how much? He'll tell you.

Google's "Jolly Good Fellow," Chade-Meng Tan, talks about how the company practices compassion in its everyday business -- and its bold side projects.

Four-star general Stanley McChrystal shares what he learned about leadership over his decades in the military. How can you build a sense of shared purpose among people of many ages and skill sets? By listening and learning -- and addressing the possibility of failure.

In a zippy demo at TED U, AnnMarie Thomas shows how two different flavors of homemade play dough can be used to demonstrate electrical properties -- by lighting up LEDs, spinning motors, and turning little kids into circuit designers.

In a moving and madly viral video last year, composer Eric Whitaker led a virtual choir of singers from around the world. He talks through the creative challenges of making music powered by YouTube, and unveils the first 2 minutes of his new work, "Sleep," with a video choir of 2,052. The full piece premieres April 7 (yes, on YouTube!).

Sebastian Thrun helped build Google's amazing driverless car, powered by a very personal quest to save lives and reduce traffic accidents. Jawdropping video shows the DARPA Challenge-winning car motoring through busy city traffic with no one behind the wheel, and dramatic test drive footage from TED2011 demonstrates how fast the thing can really go.

"Puppets always have to try to be alive," says Adrian Kohler of the Handspring Puppet Company, a gloriously ambitious troupe of human and wooden actors. Beginning with the tale of a hyena's subtle paw, puppeteers Kohler and Basil Jones build to the story of their latest astonishment: the wonderfully life-like Joey, the War Horse, who trots (and gallops) convincingly onto the TED stage.

When first discovered in 2010, the Stuxnet computer worm posed a baffling puzzle. Beyond its unusually high level of sophistication loomed a more troubling mystery: its purpose. Ralph Langner and team helped crack the code that revealed this digital warhead's final target -- and its covert origins. In a fascinating look inside cyber-forensics, he explains how.

At TEDxDubai, longtime English teacher Patricia Ryan asks a provocative question: Is the world's focus on English preventing the spread of great ideas in other languages? (For instance: what if Einstein had to pass the TOEFL?) It's a passionate defense of translating and sharing ideas.

"The human voice: mysterious, spontaneous, primal." With these words, soprano Claron McFadden invites us to explore the mysteries of breathing and singing, as she performs the challenging "Aria," by John Cage.

Eythor Bender of Berkeley Bionics brings onstage two amazing exoskeletons, HULC and eLEGS -- robotic add-ons that could one day allow a human to carry 200 pounds without tiring, or allow a wheelchair user to stand and walk. It's a powerful onstage demo, with implications for human potential of all kinds.

At TEDxPeachtree, bioethicist Paul Root Wolpe describes an astonishing series of recent bio-engineering experiments, from hybrid pets to mice that grow human ears. He asks: isn't it time to set some ground rules?

With never-before-seen video, primatologist Isabel Behncke Izquierdo shows how bonobo ape society learns from constantly playing -- solo, with friends, even as a prelude to sex. Indeed, play appears to be the bonobos' key to problem-solving and avoiding conflict. If it works for our close cousins, why not for us?

What was the greatest invention of the industrial revolution? Hans Rosling makes the case for the washing machine. With newly designed graphics from Gapminder, Rosling shows us the magic that pops up when economic growth and electricity turn a boring wash day into an intellectual day of reading. TODAY: From 11:30am-1:30pm EDT, Hans Rosling will be answering questions in TED Conversations. Pop over!

"If I should have a daughter, instead of Mom, she's gonna call me Point B ... " began spoken word poet Sarah Kay, in a talk that inspired two standing ovations at TED2011. She tells the story of her metamorphosis -- from a wide-eyed teenager soaking in verse at New York's Bowery Poetry Club to a teacher connecting kids with the power of self-expression through Project V.O.I.C.E. -- and gives two breathtaking performances of "B" and "Hiroshima."

Lighting architect Rogier van der Heide offers a beautiful new way to look at the world -- by paying attention to light (and to darkness). Examples from classic buildings illustrate a deeply thought-out vision of the play of light around us.

Volunteer firefighter Mark Bezos tells a story of an act of heroism that didn't go quite as expected -- but that taught him a big lesson: Don't wait to be a hero.

We think of space as a silent place. But physicist Janna Levin says the universe has a soundtrack -- a sonic composition that records some of the most dramatic events in outer space. (Black holes, for instance, bang on spacetime like a drum.) An accessible and mind-expanding soundwalk through the universe.

Tapping into the findings of his latest book, NYTimes columnist David Brooks unpacks new insights into human nature from the cognitive sciences -- insights with massive implications for economics and politics as well as our own self-knowledge. In a talk full of humor, he shows how you can't hope to understand humans as separate individuals making choices based on their conscious awareness.

With streams and rivers drying up because of over-usage, Rob Harmon has implemented an ingenious market mechanism to bring back the water. Farmers and beer companies find their fates intertwined in the intriguing century-old tale of Prickly Pear Creek.

MIT researcher Deb Roy wanted to understand how his infant son learned language -- so he wired up his house with videocameras to catch every moment (with exceptions) of his son's life, then parsed 90,000 hours of home video to watch "gaaaa" slowly turn into "water." Astonishing, data-rich research with deep implications for how we learn.

Salman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises, and calls for teachers to consider flipping the traditional classroom script -- give students video lectures to watch at home, and do "homework" in the classroom with the teacher available to help.

Blogger Courtney Martin examines the perennially loaded word "feminism" in this personal and heartfelt talk. She talks through the three essential paradoxes of her generation's quest to define the term for themselves.