Daryl Hannah gathers TED Talks that span the globe, from the Black Hills Mountains of the United States to the underwater worlds of Antarctica.

Ocean explorer Robert Ballard takes us on a mindbending trip to hidden worlds underwater, where he and other researchers are finding unexpected life, resources, even new mountains. He makes a case for serious exploration and mapping. Google Ocean, anyone?

Games like World of Warcraft give players the means to save worlds, and incentive to learn the habits of heroes. What if we could harness this gamer power to solve real-world problems? Jane McGonigal says we can, and explains how.

Sure, we're looking beyond the planet to other worlds we may one day inhabit -- but a lot of this technology we've developed can be used for the good of the Earth, too.

Nations can now attack other nations with cyber weapons: silent strikes on another country's computer systems, power grids, dams that leave no trace behind. (Think of the Stuxnet worm.) Guy-Philippe Goldstein shows how cyberattacks can leap between the digital and physical worlds to prompt armed conflict -- and how we might avert this global sec...

About this talk: The United Nations has set a goal to free the world from hunger, poverty and HIV related deaths. But where does the money come from? Conscious capitalist Sahil Sethi identifies a sector resource-rich enough to make the UN’s ambitious goals a reality: the corporate world. By donating .7% of their annual profits to the UN goals, h...

With scissors and paper, artist Béatrice Coron creates intricate worlds, cities and countries, heavens and hells. Striding onstage in a glorious cape cut from Tyvek, she describes her creative process and the way her stories develop from snips and slices.

A unique ecosystem of plants, birds and monkeys thrives in the treetops of the rainforest. Nalini Nadkarni explores these canopy worlds -- and shares her findings with the world below, through dance, art and bold partnerships.

Cave explorer and geologist Francesco Sauro travels to the hidden continent under our feet, surveying deep, dark places inside the earth that humans have never been able to reach before. In the spectacular tepuis of South America, he finds new minerals and insects that have evolved in isolation, and he uses his knowledge of these alien worlds to...

Kristina Gjerde studies the law of the high seas -- the 64 percent of our ocean that isn't protected by any national law at all. Gorgeous photos show the hidden worlds that Gjerde and other lawyers are working to protect from trawling and trash-dumping, through smart policymaking and a healthy dose of PR.

James Cameron's big-budget (and even bigger-grossing) films create unreal worlds all their own. In this personal talk, he reveals his childhood fascination with the fantastic -- from reading science fiction to deep-sea diving -- and how it ultimately drove the success of his blockbuster hits "Aliens," "The Terminator," "Titanic" and "Avatar."

We're bringing gameplay into more aspects of our lives, spending countless hours -- and real money -- exploring virtual worlds for imaginary treasures. Why? As Tom Chatfield shows, games are perfectly tuned to dole out rewards that engage the brain and keep us questing for more.

Taryn Simon exhibits her startling take on photography -- to reveal worlds and people we would never see otherwise. She shares two projects: one documents otherworldly locations typically kept secret from the public, the other involves haunting portraits of men convicted for crimes they did not commit.

Danielle Feinberg, Pixar's director of photography, creates stories with soul and wonder using math, science and code. Go behind the scenes of Finding Nemo, Toy Story, Brave, WALL-E and more, and discover how Pixar interweaves art and science to create fantastic worlds where the things you imagine can become real. This talk comes from the PBS sp...

Clear, compelling talks on big issues facing the global economy.

These speakers offer beautiful, sweeping, simple life advice — the kind to tuck in the back of your mind and let inspire you onward.

Take a trip around the globe and enjoy music from all corners of the Earth.

Michael Rain is on a mission to tell the stories of first-generation immigrants, who have strong ties both to the countries they grew up in and their countries of origin. In a personal talk, he breaks down the mischaracterizations and limited narratives of immigrants and shares the stories of the worlds they belong to. "We're walking melting pot...

Science fiction writer Monica Byrne imagines rich worlds populated with characters who defy our racial, social and gender stereotypes. In this performance, Byrne appears as a hologram named Pilar, transmitting a story of love and loss back to us from a near future when humans have colonized the universe. "It's always funny what you think the fut...

Learn how these microorganisms influence everything from the air we breathe and how healthy we are, to forming life itself.

TEDYouth 2014 took place at the Brooklyn Museum in New York City on Saturday, November 15 from 11am to 6pm ET. At TEDYouth — and the TEDxYouthDay 2014 events happening the same day around the globe — young people gathered to explore the theme: "Worlds Imagined." They heard mind-shifting stories and big ideas in a broad array of topics that impac...

Embrace our wide-open shareable future -- where everything's hackable and the power of the crowd propels innovation.

In Tana Toraja, weddings and births aren't the social gatherings that knit society together. In this part of Indonesia, big, raucous funerals are at the center of social life. Anthropologist Kelli Swazey takes a look at this culture, in which the bodies of dead relatives are cared for years after they have passed away -- because relationships wi...

An exploration of faith’s place in our current, tumultuous times.

Humans will soon have new bodies that forever blur the line between the natural and synthetic worlds, says bionics designer Hugh Herr. In an unforgettable talk, he details "NeuroEmbodied Design," a methodology for creating cyborg function that he's developing at the MIT Media Lab, and shows us a future where we've augmented our bodies in a way t...

The little things that you (yes, you) can do now (yes, now) to make a difference.

About this performance: As 12 musicians from disparate cultures harmonize their eastern and western scales, they show the long bridges that music can build.

Zoom in -- way, way in -- to look at the world from speck's-eye view. Learn about very tiny insects, the world at the nanoscale, and sculptures so small it's best to hold your breath while viewing.

Fantastical settings, awe-inspiring landscapes ... Let these talks inspire and guide you in imagining a world of your own creation.

4 reasons why you shouldn't be afraid to make up new words (no matter how ridiculous they may sound).