Can we fight terror without destroying democracy? Internet freedom activist Rebecca MacKinnon thinks that we'll lose the battle against extremism and demagoguery if we censor the internet and press. In this critical talk, she calls for a doubling-down on strong encryption and appeals to governments to better protect, not silence, the journalists...

People-powered resistance: can it work? Srdja Popovic led the nonviolent movement that took down Milosevic in Serbia in 2000; he lays out the plans, skills and tools that a people-powered movement needs -- from nonviolent tactics to a sense of humor.

“If you really want to know a people, start by looking inside their bedrooms," says Shereen El Feki, who traveled through the Middle East for five years, talking to people about sex. While those conversations reflected rigid norms and deep repression, El Feki also discovered that sexual conservatism in the Arab world is a relatively new thing. S...

Months after he was born, in 1948, Ron McCallum became blind. In this charming, moving talk, he shows how he reads -- and celebrates the progression of clever tools and adaptive computer technologies that make it possible. With their help, and the help of volunteers, he's become a lawyer, an academic, and, most of all, a voracious reader. Welcom...

Sound design is built on deception -- when you watch a movie or TV show, nearly all of the sounds you hear are fake. In this audio-rich talk, Tasos Frantzolas explores the role of sound in storytelling and demonstrates just how easily our brains are fooled by what we hear.

Computer science professor Shimon Schocken is also an avid mountain biker. To share the life lessons he learned while riding, he began an outdoor program with Israel's juvenile inmates and was touched by both their intense difficulties and profound successes. Photographs by Raphael Rabinovitz.

At his day job, Steve Truglia flips cars, walks through fire and falls out of buildings -- pushing technology to make stunts bigger, safer, more awesome. He talks us through his next stunt: the highest jump ever attempted, from the very edge of space.

Strange landscapes, scorching heat and (sometimes) mad crocodiles await scientists seeking clues to evolution's genius. Paleontologist Paul Sereno talks about his surprising encounters with prehistory -- and a new way to help students join the adventure.

Margaux Salcedo is a writer and media strategist who specialized in presidential and other national political campaigns for 12 years before starting her own publishing company and the award-winning faith website Dominus Est.

What is belief, anyways? In this inspiring, witty, and emotional talk, Michael Marckx recounts how his life’s greatest hardship led him to executive positions in several renowned organizations and how he found success in hitting rock-bottom. BIO: Michael Marckx is beer fan and branding expert, in that order. As Chief Disruption Officer at Crea...

Il y a quatre ans, la plus puissante intuition de sa vie fait prendre à Margaux LA décision qui bouleversera tout. Elle quitte sa vie parisienne (en apparence) idéale et part se perdre en Amérique latine dans l’espoir de se (re)trouver. Baroudeuse dans l’âme, elle passe finalement trois années sur la route et parcourt 100 000 kilomètres lors d’u...

In this powerfully rational talk, Iliana speaks out about the 'anomaly' of homophobia around the world, and her personal experience of discovering sexual diversity in her close environment.