Jon Willis is a professor of astronomy at the University of Victoria in British Columbia, Canada. His day job, if you like to call it that, is to study the physical contents of the Universe with a particular focus upon giant clusters of galaxies both for what they can tell us about the large-scale properties of the Universe and the astrophysics of galaxy evolution. However, alongside astronomy, Prof. Willis is fascinated by the science of astrobiology: the search for life in the Universe. This interest has seen him travel the world in order to answer the questions not just of 'What does an astrobiologist actually do?' but also 'What does a scientific field look like as it approaches its defining moment of detecting life?' The Pale Blue Data Point: An Earth-based Perspective on the Search for Alien Life is his current book. Why science? I like answering questions, finding things out and, for me at least, science provides the language and definitions to do these things...