Under the constant gaze of a CO2 sensor, Dr Shane and Dr Ray discuss underwater algal pollination and the fact that peat moss may be just what we need to turn asteroid dirt into a viable garden for future explorers. Staying in space, Associate Professor Duncan Galloway from the Monash University School of Physics and Astronomy, unpacks fifteen years of new knowledge on gravitational waves; while back on earth, Robyn Schofield, Associate Professor In Atmospheric Chemistry Geography, Earth and Atmospheric Sciences, University of Melbourne, talks about carbon dioxide and all things aerosols  - including why she brought the sensor that has Dr Shane so worried!

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