Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

With a dusty backhoe, a handful of Japanese paint markers and a few students in tow, Deborah Gordon digs up ant colonies in the Arizona desert in search of keys to understanding complex systems.

Ant biologist Deborah M. Gordon has spent decades digging in the Arizona desert to decipher the chemical, genetic and behavioral codes of ant colonies. Contrary to the popular notion that colonies have evolved into efficient, organized systems, she has instead discovered that the long evolution of the ant colony has resulted in a system driven by accident, adaptation and the chaos and "noise" of unconscious communication. 

Diane Benscoter spent five years as a "Moonie." She shares an insider's perspective on the mind of a cult member, and proposes a new way to think about today's most troubling conflicts and extremist movements.

At 17, Diane Benscoter joined The Unification Church -- the religious cult whose members are commonly known as “Moonies.” After five long years, her distressed family arranged to have her deprogrammed. Benscoter then left The Unification Church, and was so affected by her experience that she became a deprogrammer herself. She devoted her time to extracting others from cults, until she was arrested for kidnapping. The shock of her arrest caused her to abandon her efforts for almost 20 years.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Bennington president Liz Coleman delivers a call-to-arms for radical reform in higher education. Bucking the trend to push students toward increasingly narrow areas of study, she proposes a truly cross-disciplinary education -- one that dynamically combines all areas of study to address the great problems of our day.

If you followed higher education news in the 1990s, you have an opinion on Liz Coleman. The president of what was once the most expensive college in America, Coleman made a radical, controversial plan to snap the college out of a budget and mission slump -- by ending the tenure system, abolishing academic divisions and yes, firing a lot of professors. It was not a period without drama.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Every day, in a city the size of London, 30 million meals are served. But where does all the food come from? Architect Carolyn Steel discusses the daily miracle of feeding a city, and shows how ancient food routes shaped the modern world.

The question of how to feed cities may be one of the biggest contemporary questions, yet it's never asked: we take for granted that if we walk into a store or a restaurant, food will be there, magically coming from somewhere. Yet, think of it this way: just in London, every single day, 30 million meals must be provided. Without a reliable food supply, even the most modern city would collapse quickly. And most people today eat food of whose provenance they are unaware.

Susan notes: Thanks to TED for making TED Talks downloadable and embeddable, and for providing the biographical information that goes along with them.

Robin Chase founded Zipcar, the world’s biggest car-sharing business. That was one of her smaller ideas. Here she travels much farther, contemplating road-pricing schemes that will shake up our driving habits and a mesh network vast as the Interstate.

If she weren't a proven start-up entrepreneur, you might imagine Robin Chase as a transportation geek, some dedicated civil servant, endlessly refining computer models of freeway traffic. Or if she weren't such a green-conscious problem-solver, you might take her for a businesswoman only. Ultimately, the best way to understand Chase is simply as a remarkable innovator.