For almost three decades, John Francis has been a planetwalker, traveling the globe by foot and sail with a message of environmental respect and responsibility (for 10 of those years without speaking). A funny, thoughtful talk with occasional banjo.

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http://www.ted.com James Surowiecki pinpoints the moment when social media became an equal player in the world of news-gathering: the 2005 tsunami, when YouTube video, blogs, IMs and txts carried the news — and preserved moving personal stories from the tragedy.

http://www.ted.com Graham Hawkes takes us aboard his graceful, winged submarines to the depths of planet Ocean (a.k.a. “Earth”). It’s a deep blue world we landlubbers rarely see in 3D.

http://www.ted.com Filmmaker Newton Aduaka shows clips from his powerful, lyrical feature film “Ezra,” about a child soldier in Sierra Leone.

http://www.ted.com The Inventables guys, Zach Kaplan and Keith Schacht, demo some amazing new materials and how we might use them. Look for squishy magnets, odor-detecting ink, “dry” liquid and a very surprising 10-foot pole.