Paul MacCready -- aircraft designer, environmentalist, and lifelong lover of flight -- talks about his long career.

In 1998, aircraft designer Paul MacCready looks at a planet on which humans have utterly dominated nature, and talks about what we all can do to preserve nature's balance. His contribution: solar planes, superefficient gliders and the electric car.

Philosopher Dan Dennett calls for religion -- all religion -- to be taught in schools, so we can understand its nature as a natural phenomenon. Then he takes on The Purpose-Driven Life, disputing its claim that, to be moral, one must deny evolution.

Paula McGuire delivers an insightful and amusing talk on how to be successful at failing. Through a series of anecdotes, she describes her struggles with anxiety and how one key decision saved her life and how it can save yours, if you decide to be good - at failing.