DR RHODRI EVANS studied Physics at Imperial College London, graduating with First Class honours, before gaining his PhD in Astrophysics from Cardiff University. He has taught at the University of Toledo in the United States, at Swarthmore College and done post-doctoral research at the University of Chicago's Yerkes Observatory, 'the birthplace of modern astrophysics'. He is currently a research fellow at Cardiff University, with a particular interest in infrared astronomy. Rhodri is the author of numerous academic papers as well as popular-science articles, he speaks regularly at conferences and is a regular contributor to the BBC on Physics and Astronomy. His popular blog can be found at thecuriousastronomer.wordpress.com.