Society

From the Arab Spring to the emerging democracies of Eastern Europe, a new generation of freedom fighters -- entrepreneurs, journalists, activists -- shares powerful stories of resistance against dictatorships and oppression.

Behold, courage. These speakers have the fortitude to stand up to some of the world's greatest injustices.

As machines grow ever more intelligent, they're emerging not just as powerful tools, but close companions. These talks -- while offering some whizzy demos -- examine how robots are becoming an intimate part of our lives.

Master architects share their vision for buildings that inflate, float, twist and glitter, while artfully addressing the challenges faced by their residents, their cities and the planet.