Edward Stone is a professor of physics at the California Institute of Technology who has served as project scientist for the Voyager program from 1972 to the present. Since the launch of the two Voyager spacecraft in 1977, Stone has coordinated the efforts of 11 teams of scientists in their investigations of Jupiter, Saturn, Uranus and Neptune. He served as director of Jet Propulsion Laboratory from 1991 to 2001. Highlights of his career include: Galileo's five-year orbital mission to Jupiter, the launch of Cassini to Saturn, the launch of Mars Global Surveyor and a new generation of Earth science satellites such as TOPEX/Poseidon and SeaWinds, and the successful Mars Pathfinder landing in 1997. Dr. Stone has agreed to sit down with us and answer any questions you may have about his time at JPL and space exploration. As usual, ask as many as you'd like, but please, one question per post.