It's the holy grail of flight -- propulsion without the expenditure of reaction mass. A practical reactionless drive system would render wheeled vehicles (flying cars, anyone?), aircraft with wings, and rockets as we know them obsolete. But is it real? Can it ever be real?

This episode covers the history of attempts at reactionless drives, and some recent news on a related controversy that "New Scientist" magazine unwittingly stirred up. In a first for this podcast, this episode has been researched and presented by a Geek Counterpoint listener -- Jason, from Brisbane, Australia. Let's all give Jason a warm welcome, and listen in as he gets us up to speed on this technology that lies somewhere between science and science fiction.