Geoffrey Landis, NASA Engineer, who has had a great track record with solar sails and interstellar propulsion gave a talk on negative mass at the Interstellar Research Group. He explained how negative mass could be the basis of faster than light observations related to inflation. What we still need to discover is what is preventing the generation of negative mass. Physics indicates that negative mass should be generated all the time, but it is not. There needs to be some unknown physical conservation law that prevents negative mass now but permitted negative mass during the inflation epoch of the universe.