Dean Kamen: The emotion behind invention

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Soldiers who've lost limbs in service face a daily struggle unimaginable to most of us. At TEDMED, Dean Kamen talks about the profound people and stories that motivated his work to give parts of their lives back with his design for a remarkable prosthetic arm.

Elizabeth Pisani: Sex, drugs and HIV -- let's get rational

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Armed with bracing logic, wit and her "public-health nerd" glasses, Elizabeth Pisani reveals the myriad of inconsistencies in today's political systems that prevent our dollars from effectively fighting the spread of HIV. Her research with at-risk populations -- from junkies in prison to sex workers on the street in Cambodia -- demonstrates the sometimes counter-intuitive measures that could stall the spread of this devastating disease.
Original video source (ElizabethPisani_2010.mp4)

Adora Svitak: What adults can learn from kids

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Child prodigy Adora Svitak says the world needs "childish" thinking: bold ideas, wild creativity and especially optimism. Kids' big dreams deserve high expectations, she says, starting with grownups' willingness to learn from children as much as to teach.

Joel Levine: Why we need to go back to Mars

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At TEDxNASA, planetary scientist Joel Levine shows some intriguing -- and puzzling -- new discoveries about Mars: craters full of ice, traces of ancient oceans, and compelling hints at the presence, sometime in the past, of life. He makes the case for going back to Mars to find out more.

Marc Pachter: The art of the interview

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Marc Pachter has conducted live interviews with some of the most intriguing characters in recent American history as part of a remarkable series created for the Smithsonian's National Portrait Gallery. He reveals the secret to a great interview and shares extraordinary stories of talking with Steve Martin, Clare Booth Luce and more.

Jamie Heywood: The big idea my brother inspired

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When Jamie Heywood's brother was diagnosed with ALS, he devoted his life to fighting the disease as well. The Heywood brothers built an ingenious website where people share and track data on their illnesses -- and they discovered that the collective data had enormous power to comfort, explain and predict.

Sendhil Mullainathan: Solving social problems with a nudge

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MacArthur winner Sendhil Mullainathan uses the lens of behavioral economics to study a tricky set of social problems -- those we know how to solve, but don't. We know how to reduce child deaths due to diarrhea, how to prevent diabetes-related blindness and how to implement solar-cell technology ... yet somehow, we don't or can't. Why?

Jane Chen: A warm embrace that saves lives

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In the developing world, access to incubators is limited by cost and distance, and millions of premature babies die each year. TED Fellow Jane Chen shows an invention that could keep millions

Bertrand Piccard's solar-powered adventure

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For the dawn of a new decade, adventurer Bertrand Piccard offers us a challenge: Find motivation in what seems impossible. He shares his own plans to do what many say can't be done -- to fly around the world, day and night, in a solar-powered aircraft.

Steven Cowley: Fusion is energy's future

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Physicist Steven Cowley is certain that nuclear fusion is the only truly sustainable solution to the fuel crisis. He explains why fusion will work -- and details the projects that he and many others have devoted their lives to, working against the clock to create a new source of energy.

Shaffi Mather: A new way to fight corruption

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Shaffi Mather explains why he left his first career to become a social entrepreneur, providing life-saving transportation with his company 1298 for Ambulance. Now, he has a new idea and plans to begin a company to fight the booming business of corruption in public service, eliminating it one bribe at a time.

James Geary, metaphorically speaking

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Aphorism enthusiast and author James Geary waxes on a fascinating fixture of human language: the metaphor. Friend of scribes from Aristotle to Elvis, metaphor can subtly influence the decisions we make, Geary says.

Alexis Ohanian: How to make a splash in social media

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In a funny, rapid-fire 4 minutes, Alexis Ohanian of Reddit tells the real-life fable of one humpback whale's rise to Web stardom. The lesson of Mister Splashy Pants is a shoo-in classic for meme-makers and marketers in the Facebook age.

Loretta Napoleoni: The intricate economics of terrorism

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Loretta Napoleoni details her rare opportunity to talk to the secretive Italian Red Brigades -- an experience that sparked a lifelong interest in terrorism. She gives a behind-the-scenes look at its complex economics, revealing a surprising connection between money laundering and the US Patriot Act.

Shereen El Feki: Pop culture in the Arab world

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At TEDGlobal University, Shereen El Feki shows how some Arab cultures are borrowing trademarks of Western pop culture -- music videos, comics, even Barbie -- and adding a culturally appropriate twist. The hybridized media shows how two civilizations, rather than dividing, can dovetail.

Thulasiraj Ravilla: How low-cost eye care can be world-class

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India's revolutionary Aravind Eye Care System has given sight to millions. Thulasiraj Ravilla looks at the ingenious approach that drives its treatment costs down and quality up, and why its methods should trigger a re-think of all human services.

Scott Kim takes apart the art of puzzles

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At the 2008 EG conference, famed puzzle designer Scott Kim takes us inside the puzzle-maker's frame of mind. Sampling his career's work, he introduces a few of the most popular types, and shares the fascinations that inspired some of his best.

Anupam Mishra: The ancient ingenuity of water harvesting

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With wisdom and wit, Anupam Mishra talks about the amazing feats of engineering built centuries ago by the people of India's Golden Desert to harvest water. These structures are still used today -- and are often superior to modern water megaprojects.

Andrea Ghez: The hunt for a supermassive black hole

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With new data from the Keck telescopes, Andrea Ghez shows how state-of-the-art adaptive optics are helping astronomers understand our universe's most mysterious objects: black holes. She shares evidence that a supermassive black hole may be lurking at the center of the Milky Way.

Gordon Brown on global ethic vs. national interest

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Can the interests of an individual nation be reconciled with humanity's greater good? Can a patriotic, nationally elected politician really give people in other countries equal consideration? Following his TEDTalk calling for a global ethic, UK Prime Minister Gordon Brown fields questions from TED Curator Chris Anderson.

Shashi Tharoor: Why nations should pursue "soft" power

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India is fast becoming a superpower, says Shashi Tharoor -- not just through trade and politics, but through "soft" power, its ability to share its culture with the world through food, music, technology, Bollywood. He argues that in the long run it's not the size of the army that matters as much as a country's ability to influence the world's hearts and minds.

Rob Hopkins: Transition to a world without oil

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Rob Hopkins reminds us that the oil our world depends on is steadily running out. He proposes a unique solution to this problem -- the Transition response, where we prepare ourselves for life without oil and sacrifice our luxuries to build systems and communities that are completely independent of fossil fuels.

Magnus Larsson: Turning dunes into architecture

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Architecture student Magnus Larsson details his bold plan to transform the harsh Sahara desert using bacteria and a surprising construction material: the sand itself.

Hans Rosling: Asia's rise -- how and when

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Hans Rosling was a young guest student in India when he first realized that Asia had all the capacities to reclaim its place as the world's dominant economic force. At TEDIndia, he graphs global economic growth since 1858 and predicts the exact date that India and China will outstrip the US.

Tom Wujec demos the 13th-century astrolabe

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Rather than demo another new technology, Tom Wujec reaches back to one of our earliest but most ingenious devices -- the astrolabe. With thousands of uses, from telling time to mapping the night sky, this old tech reminds us that the ancient can be as brilliant as the brand-new.