Caitlin Howlett interviews Kate Hennessy, editor of 10daysofscience.com about the Ultimo Science Festival, Victoria Bond celebrates 400 years of Galilean astronomy, Dan Keogh and Caitlin Howlett lead a discussion on the science of marijuana with Celine Steinfield, Victoria Bond, Kate Hennessy and Ian Woolf - it really addictive?, Presented and produced by Ian Woolf