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Humans are off to live on Mars. At least, that’s the case journalist Stephen Petranek makes in his TED Book, “How We’ll Live on Mars.” According to Petranek, the move is no less than an “essential back-up plan for humanity.” Here, he shares just some of the factors those who make the first trip will have to manage.

Linda Cliatt-Wayman has spent her career working in low-income, low-performing schools. She has developed a thick skin and a tough attitude … laced with fierce love for her students. Here, she shares her approach to fixing a broken system and doing right by kids who deserve the best.

Formula E, the world’s first fully electric racing series, has cars that swish rather than scream — and all the drivers drive the same design of car. Driver Nicolas Prost shares the secrets behind a very modern contest.

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It’s still early days for virtual reality, but filmmaker Chris Milk is bullish about the possibilities. Here, the man who melted the Internet with projects for Arcade Fire and Johnny Cash mulls the possibilities of the medium he’s betting on in a big way.

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Human beings have made enormous changes to Earth, reshaping it, developing it and generally altering it so much that in many cases its pre-human condition has become unrecognizable. In this far-ranging conversation, ecologist Erle Ellis and landscape architect Bradley Cantrell discuss what this means for ecology and architecture … and how we might think about protecting our planet.

The unintended consequences of being "tough on crime" | ideas.ted.com

“We’re in this exciting moment where we’ve had 40 years of being ‘tough on crime,’ and we’ve finally come to recognize that it really hasn’t worked very well,” says sociologist Alice Goffman bluntly. America needs to think differently.

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The current approach to treating Ebola is makeshift, at best. A doctor shares the reality of life on the humanitarian frontline in Liberia, while Bill Gates calls for a new approach to treating epidemics.