A theologian and a neuroscientist explore the concept of consciousness: is it unique to humans? Are we all simply machines? Do we have free will? Can we invoke an enhanced collective consciousness? Bringing together findings from science and insights from religion they unpick what it means to be conscious. Williams is Master of Magdalene College, Cambridge and a former Archbishop of Canterbury. Critchlow is named as a British Council's Top 100 UK Scientists for her work in communication and author of Consciousness: A LadyBird Expert book, which will be launched at Hay.