Kevin Slavin argues that we're living in a world designed for -- and increasingly controlled by -- algorithms. In this riveting talk from TEDGlobal, he shows how these complex computer programs determine: espionage tactics, stock prices, movie scripts, and architecture. And he warns that we are writing code we can't understand, with implications we can't control.

As web companies strive to tailor their services (including news and search results) to our personal tastes, there's a dangerous unintended consequence: We get trapped in a "filter bubble" and don't get exposed to information that could challenge or broaden our worldview. Eli Pariser argues powerfully that this will ultimately prove to be bad for us and bad for democracy.

Janet Echelman found her true voice as an artist when her paints went missing -- which forced her to look to an unorthodox new art material. Now she makes billowing, flowing, building-sized sculpture with a surprisingly geeky edge. A transporting 10 minutes of pure creativity.

John Hunter puts all the problems of the world on a 4'x5' plywood board -- and lets his 4th-graders solve them. At TED2011, he explains how his World Peace Game engages schoolkids, and why the complex lessons it teaches -- spontaneous, and always surprising -- go further than classroom lectures can.

In a moving and madly viral video last year, composer Eric Whitacre 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.

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.

"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. A performing poet since she was 14 years old, Sarah Kay is the founder of Project V.O.I.C.E, teaching poetry and self-expression at schools across the United States.

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.

How can architects build a new world of sustainable beauty? By learning from nature. At TEDSalon in London, Michael Pawlyn describes three habits of nature that could transform architecture and society: radical resource efficiency, closed loops, and drawing energy from the sun.

Work-life balance, says Nigel Marsh, is too important to be left in the hands of your employer. At TEDxSydney, Marsh lays out an ideal day balanced between family time, personal time and productivity -- and offers some stirring encouragement to make it happen.

Diagnosed with cancer, Bruce Feiler worried first about his young family. So -- as he shares in this funny, rambling and ultimately thoughtful talk -- he asked his closest friends to become a "council of dads," bringing their own lifetimes of wisdom to advise his twin daughters as they grow.

Please allow yourself to be inspired!

There's an angry divisive tension in the air that threatens to make modern politics impossible. Elizabeth Lesser explores the two sides of human nature within us (call them "the mystic" and "the warrior”) that can be harnessed to elevate the way we treat each other. She shares a simple way to begin real dialogue -- by going to lunch with someone who doesn't agree with you, and asking them three questions to find out what's really in their hearts.

Neil Pasricha's blog 1000 Awesome Things savors life's simple pleasures, from free refills to clean sheets. In this heartfelt talk from TEDxToronto, he reveals the 3 secrets (all starting with A) to leading a life that's truly awesome.

If you've been in a restaurant kitchen, you've seen how much food, water and energy can be wasted there. Chef Arthur Potts-Dawson shares his very personal vision for drastically reducing restaurant, and supermarket, waste -- creating recycling, composting, sustainable engines for good (and good food).

With profound simplicity, Coach John Wooden redefines success and urges us all to pursue the best in ourselves. In this inspiring talk he shares the advice he gave his players at UCLA, quotes poetry and remembers his father's wisdom.

Halla Tomasdottir managed to take her company Audur Capital through the eye of the financial storm in Iceland by applying 5 traditionally "feminine" values to financial services. At TEDWomen, she talks about these values and the importance of balance.

Entrepreneur Gary Vaynerchuk gives a shot in the arm to dreamers and up-and-comers who face self-doubt. The Internet has made the formula for success simpler than ever, he argues. So there's now no excuse not to do what makes you happy.

Sharing powerful stories from his anti-obesity project in Huntington, W. Va., TED Prize winner Jamie Oliver makes the case for an all-out assault on our ignorance of food.

Using a principle he calls “convex lens leadership,” R.A. Mashelkar’s vision has catapulted india’s talent for science and innovation onto the international stage. He shares three stories of ultra-low-cost design from India that use bottom-up rethinking, and some clever engineering, to bring expensive products (cars, prosthetics) into the realm of the possible for everyone.

What do you think of people in poverty? Maybe what Jessica Jackley once did: "they" need "our" help, in the form of a few coins in a jar. The co-founder of Kiva.org talks about how her attitude changed -- and how her work with microloans has brought new power to people who live on a few dollars a day.