This month we're diving into dark matter, that unknown stuff that makes up a quarter of the Universe. Where is it, what is it, and how do we know it's even there? To find out, Adam Murphy and Ben McAllister speak to Alan Duffy from Swinburne University, who works in the newly-minted Australian Research Council Centre of Excellence for Dark Matter Particle Physics, which is also where Ben works! Like this podcast? Please help us by supporting the Naked Scientists