A tour of thoughtful spaces built to bring people together and strengthen communities, rather than wall them off from one another.

Microsoft's Stephen Lawler gives a whirlwind tour of Virtual Earth, moving up, down and through its hyper-real cityscapes with dazzlingly fluidity, a remarkable feat that requires staggering amounts of data to bring into focus.

Take this tour of medicine's future with some of the trailblazing doctors charting its course. Once you've seen a transplantable human kidney created from a 3D printer, almost anything is imaginable ...

Reed Kroloff gives us a new lens for judging new architecture: is it modern, or is it romantic? Look for glorious images from two leading practices -- and a blistering critique of the 9/11 planning process.

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.

Gravity. The stars in day. Thoughts. The human genome. Time. Atoms. So much of what really matters in the world is impossible to see. A stunning animation of John Lloyd's classic TEDTalk from 2009, which will make you question what you actually know. [Directed by Cognitive Media, narration by John Lloyd].

Jamil Abu-Wardeh jump-started the comedy scene in the Arab world by founding the Axis of Evil Middle East Comedy Tour, which brings standup comedians to laughing audiences all over the region. He's found that, by respecting the "three B's" (blue material, beliefs and "bolitics"), the Axis of Evil comics find plenty of cross-border laughs.

Want to navigate the solar system without having to buy a spacecraft? Jon Nguyen demos NASA JPL's "Eyes on the Solar System" -- free-to-use software for exploring the planets, moons, asteroids, and spacecraft that rotate around our sun in real-time.

Zambia-born filmmaker Franco Sacchi tours us through Nollywood, Nigeria's booming film industry (the world's 3rd largest). Guerrilla filmmaking and brilliance under pressure from crews that can shoot a full-length feature in a week.

In this hilarious, whirlwind tour of the last four billion years of evolution, paleontologist and TED Fellow Lauren Sallan introduces us to some of the wildly diverse animals that roamed the prehistoric planet (from sharks with wings to galloping crocodiles and long-necked rhinos) and shows why paleontology is about way more than dinosaurs.

Robert Neuwirth, author of "Shadow Cities," finds the world's squatter sites -- where a billion people now make their homes -- to be thriving centers of ingenuity and innovation. He takes us on a tour.

Is outer space really the silent and lifeless place it's often depicted to be? Perhaps not. Astrophysicist and musician Matt Russo takes us on a journey through the cosmos, revealing the hidden rhythms and harmonies of planetary orbits. The universe is full of music, he says -- we just need to learn how to hear it.

Architect Thom Mayne has never been one to take the easy option, and this whistle-stop tour of the buildings he's created makes you glad for it. These are big ideas cast in material form.

"Down down, baby, down down the roller coaster..." Hip-hop owes a lot to the queens of double dutch. Ethnomusicologist Kyra Gaunt takes us on a tour of the fascinating history of the jump rope.

Why are so many things broken? In a hilarious talk from the 2006 Gel conference, Seth Godin gives a tour of things poorly designed, the 7 reasons why they are that way, and how to fix them.

Psychologist Jonathan Haidt asks a simple, but difficult question: why do we search for self-transcendence? Why do we attempt to lose ourselves? In a tour through the science of evolution by group selection, he proposes a provocative answer.

Democracy thrives on civil debate, Michael Sandel says -- but we're shamefully out of practice. He leads a fun refresher, with TEDsters sparring over a recent Supreme Court case (PGA Tour Inc. v. Martin) whose outcome reveals the critical ingredient in justice.

Author Steven Johnson takes us on a 10-minute tour of The Ghost Map, his book about a cholera outbreak in 1854 London and the impact it had on science, cities and modern society.

Vik Muniz makes art from pretty much anything, be it shredded paper, wire, clouds or diamonds. Here he describes the thinking behind his work and takes us on a tour of his incredible images.

A founding member of the Axis of Evil Comedy Tour, standup comic Maz Jobrani riffs on the challenges and conflicts of being Iranian-American -- "like, part of me thinks I should have a nuclear program; the other part thinks I can't be trusted ..."

What do 24,000 ideas look like? Ecologist Eric Berlow and physicist Sean Gourley apply algorithms to the entire archive of TEDx Talks, taking us on a stimulating visual tour to show how ideas connect globally.

Without realizing it, we're fluent in the language of pictures, says illustrator Christoph Niemann. In a charming talk packed with witty, whimsical drawings, Niemann takes us on a hilarious visual tour that shows how artists tap into our emotions and minds -- all without words.

"Rock-star physicist" Brian Cox talks about his work on the Large Hadron Collider at CERN. Discussing the biggest of big science in an engaging, accessible way, Cox brings us along on a tour of the massive project.

Artist Sarah Sze takes us on a kaleidoscopic journey through her work: immersive installations as tall as buildings, splashed across walls, orbiting through galleries -- blurring the lines between time, memory and space. Explore how we give meaning to objects in this beautiful tour of Sze's experiential, multimedia art.

Before he was a legend, architect Frank Gehry takes a whistlestop tour of his early work, from his house in Venice Beach to the American Center in Paris, which was under construction (and much on his mind) when he gave this talk.

Percussionist Sivamani delivers one of TED's liveliest and most inventive performances yet. He uses traditional Western and Eastern instruments to create a rhythmic tour de force, along with a tub of water, corrugated metal, spoons, luggage, our stage props and even a little audience participation.

Glenn Cantave uses technology to highlight narratives of the oppressed. In a tour of immersive visual projects, he shares his work with the team at Movers and Shakers NYC, a coalition that executes direct action and advocacy campaigns for marginalized communities using virtual reality, augmented reality and the creative arts.

People often credit their ideas to individual "Eureka!" moments. But Steven Johnson shows how history tells a different story. His fascinating tour takes us from the "liquid networks" of London's coffee houses to Charles Darwin's long, slow hunch to today's high-velocity web.

For the last 12 years, Carter Emmart has been coordinating the efforts of scientists, artists and programmers to build a complete 3D visualization of our known universe. He demos this stunning tour and explains how it's being shared with facilities around the world.

Join John Hardy on a tour of the Green School, his off-the-grid school in Bali that teaches kids how to build, garden, create (and get into college). The centerpiece of campus is the spiraling Heart of School, perhaps the world's largest freestanding bamboo building.