Scientist and theologian Alister McGrath is one of the most gifted thinkers in the church today, and his new book A Fine-Tuned Universe (Westminster John Knox) is a significant contribution to the contemporary conversation about science and faith. Based on his 2009 Gifford Lectures, McGrath talks about what science knows about the natural world in the 21st century, and draws out the implications of such knowledge for the debate about the existence of God.