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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.

Dame Steve Shirley | ideas.ted.com

Dame Stephanie Shirley founded a women-only computing company in 1962, determined to do her work on her terms, and to hell with the glass ceiling. In this video, introduced by US CTO Megan Smith, admire the feisty spirit who upended tech world sexism by refusing to accept it.

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Neuroscientist David Eagleman explains his latest invention, the “versatile extra-sensory transducer,” a vest installed with tiny motors that can convert sound and noise into vibrations on the back, allowing deaf people to hear the world through vibrations.

Marina Abramović | ideas.ted.com

The grande dame of performance art explains why being vulnerable isn’t an option, it’s a way of life … and why humor is an important part of her work. Really.

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Take a look at the companies and spacecraft that NASA thinks might help lead humanity’s journeys into space.