Dec 7, 2012 (Talk of the Nation) — For the latest in our "Ask an Expert" series, current NASA astronaut Donald Pettit and former astronaut Jeffrey Hoffman chat about their spaceflight experiences. From brushing your teeth to weightless dreams, the astronauts discuss the many curiosities of living in space.
This text will be replaced
Missing some content? Check the source: NPR
Copyright(c) 2014, NPR