From deep in the TED archive, Danny Hillis outlines an intriguing theory of how and why technological change seems to be accelerating, by linking it to the very evolution of life itself. The presentation techniques he uses may look dated, but the ideas are as relevant as ever.

We believe that we should work to be happy, but could that be backwards? In this fast-moving and entertaining talk from TEDxBloomington, psychologist Shawn Achor argues that actually happiness inspires productivity.

Peter van Uhm is the Netherlands’ chief of defense, but that does not mean he is pro-war. At TEDxAmsterdam he explains how his career is one shaped by a love of peace, not a desire for bloodshed -- and why we need armies if we want peace.

Imagine playing a video game controlled by your mind. Now imagine that game also teaches you about your own patterns of stress, relaxation and focus. At TEDxToronto Ariel Garten shows how looking at our own brain activity gives new meaning to the ancient dictum "know thyself."

We all want customized experiences and products -- but when faced with 700 options, consumers freeze up. With fascinating new research, Sheena Iyengar demonstrates how businesses (and others) can improve the experience of choosing.

What aspects of religion should atheists (respectfully) adopt? Alain de Botton suggests a "religion for atheists" -- call it Atheism 2.0 -- that incorporates religious forms and traditions to satisfy our human need for connection, ritual and transcendence.

We have no ways to directly observe molecules and what they do -- Drew Berry wants to change that. At TEDxSydney he shows his scientifically accurate (and entertaining!) animations that help researchers see unseeable processes within our own cells.

In 2011 three young women swept the top prizes of the first Google Science Fair. At TEDxWomen Lauren Hodge, Shree Bose and Naomi Shah described their extraordinary projects-- and their route to a passion for science.

Sebastian Wernicke thinks every TEDTalk can be summarized in six words. At TEDxZurich, he shows how to do just that -- and less.

Paddy Ashdown claims that we are living in a moment in history where power is changing in ways it never has before. In a spellbinding talk at TEDxBrussels he outlines the three major global shifts that he sees coming.

Within this generation, an extra 30 years have been added to our life expectancy -- and these years aren’t just a footnote or a pathology. At TEDxWomen, Jane Fonda asks how we can think about this new phase of our lives.

For a full year, A.J. Jacobs followed every piece of health advice he could -- from applying sunscreen by the shot glass to wearing a bicycle helmet while shopping. Onstage at TEDMED, he shares the surprising things he learned.

Alberto Cairo's clinics in Afghanistan used to close down during active fighting. Now, they stay open. At TEDxRC2 (the RC stands for Red Cross/Red Crescent), Cairo tells the powerful story of why -- and how he found humanity and dignity in the midst of war.

Every day, we make decisions that have good or bad consequences for our future selves. (Can I skip flossing just this one time?) Daniel Goldstein makes tools that help us imagine ourselves over time, so that we make smart choices for Future Us.

Every morning we wake up and regain consciousness -- that is a marvelous fact -- but what exactly is it that we regain? Neuroscientist Antonio Damasio uses this simple question to give us a glimpse into how our brains create our sense of self.

When Ramona Pierson was 22, she was hit by a drunk driver and spent 18 months in a coma. At TEDxDU she tells the remarkable story of her recovery -- drawing on the collective skills and wisdom of a senior citizens' home.

Every day, we use materials from the earth without thinking, for free. But what if we had to pay for their true value: would it make us more careful about what we use and what we waste? Think of Pavan Sukhdev as nature's banker -- assessing the value of the Earth's assets. Eye-opening charts will make you think differently about the cost of air, water, trees ...

Surgeons are taught from textbooks which conveniently color-code the types of tissues, but that's not what it looks like in real life -- until now. At TEDMED Quyen Nguyen demonstrates how a molecular marker can make tumors light up in neon green, showing surgeons exactly where to cut.

Photographer Monika Bulaj shares powerful, intimate images of Afghanistan -- of home life, of ritual, of men and women. Behind the headlines, what does the world truly know about this place?

What is a mistake? By talking through examples with his improvisational Jazz quartet, Stefon Harris walks us to a profound truth: many actions are perceived as mistakes only because we don't react to them appropriately.