What could you do with six billion dollars? Robert Zubrin thinks you could go to Mars with it. Unless you are the U.S. government, that is: then it would take closer to twenty billion dollars. Dr. Zubrin is the founder and president of Pioneer Astronautics, and a founder of The Mars Society, a group dedicated to expanding the knowledge of Mars and establishing a permanent human presence there. He knows something about space exploration, having been part of it for over sixteen years. He advocates harnessing the pent-up dreams of average citizens to finance Mars exploration. As he puts it, “a hundred million people times a hundred dollars is ten billion dollars.”