The World We Dream-- Lisa Randall, Professor of Physics, Harvard University; Ron Garan, NASA Astronaut. Putting a man on the moon was once simply a dream. What are some of today's most innovative and thought provoking visions for our future?Image:  NASA/JAXA

Google Zeitgeist is a collection of talks by people who are changing the world. Hear entrepreneurs, CEOs, storytellers, scientists, and dreamers share their visions of how we can shape tomorrow.