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What motivates us to work? Contrary to conventional wisdom, it isn't just money. But it's not exactly joy either. It seems that most of us thrive by making constant progress and feeling a sense of purpose. Behavioral economist Dan Ariely presents two eye-opening experiments that reveal our unexpected and nuanced attitudes toward meaning in our work. (Filmed at TEDxRiodelaPlata.)

It's become increasingly obvious that the dismal science of economics is not as firmly grounded in actual behavior as was once supposed. In "Predictably Irrational," Dan Ariely tells us why.

As a child growing up in North Korea, Hyeonseo Lee thought her country was “the best on the planet.” It wasn't until the famine of the 90s that she began to wonder. She escaped the country at 14, to begin a life in hiding, as a refugee in China. Hers is a harrowing, personal tale of survival and hope -- and a powerful reminder of those who face constant danger, even when the border is far behind.

Born in North Korea, Hyeonseo Lee left for China in 1997. Now living in South Korea, she has become an activist for fellow refugees.

Composer and conductor Eric Whitacre has inspired millions by bringing together "virtual choirs," singers from many countries spliced together on video. Now, for the first time ever, he creates the experience in real time, as 32 singers from around the world Skype in to join an onstage choir (assembled from three local colleges) for an epic performance of Whitacre's "Cloudburst," based on a poem by Octavio Paz.

After creating and conducting a worldwide virtual choir on YouTube, Eric Whitacre is now touring with an astonishing live choir.

When most well-intentioned aid workers hear of a problem they think they can fix, they go to work. This, Ernesto Sirolli suggests, is naïve. In this funny and impassioned talk, he proposes that the first step is to listen to the people you're trying to help, and tap into their own entrepreneurial spirit. His advice on what works will help any entrepreneur.

Ernesto Sirolli got his start doing aid work in Africa in the 70's -- and quickly realised how ineffective it was.

Throughout the history of Islam, says journalist Bobby Ghosh, there have been two sides to jihad: one, internal, a personal struggle to be better, the other external. A small minority (most recently Osama bin Laden) has appropriated the second, using it as an excuse for deadly global violence against "the West." Ghosh suggests that, now that bin Laden's worldwide organization has fragmented, it's time to reclaim the word.

Bobby Ghosh is an Editor-at-Large at Time magazine, where he covers conflict, global affairs and the Middle East. He was the magazine's Baghdad bureau chief for five years.

Body language affects how others see us, but it may also change how we see ourselves. Social psychologist Amy Cuddy shows how “power posing” -- standing in a posture of confidence, even when we don’t feel confident -- can affect testosterone and cortisol levels in the brain, and might even have an impact on our chances for success.

Amy Cuddy’s research on body language reveals that we can change other people’s perceptions — and even our own body chemistry — simply by changing body positions.

”Don't fake it till you make it. Fake it till you become it.”

Reggie WattsÂ’ beats defy boxes. Unplug your logic board and watch as he blends poetry and crosses musical genres in this larger-than-life performance.

Reggie Watts creates unpredictably brilliant performances on the spot using his voice, looping pedals and his giant brain.

In this funny and blunt talk from TEDxUW, Larry Smith pulls no punches when he calls out the absurd excuses people invent when they fail to pursue their passions.

A professor of Economics at the University of Waterloo in Canada, Larry Smith coaches his students to find the careers that they will truly love.

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.

Through his witty and literate books -- and his new School of Life -- Alain de Botton helps others find fulfillment in the everyday.

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.

Shawn Achor is the CEO of Good Think Inc., where he researches and teaches about positive psychology.