In 2007, Christopher Hitchens, Richard Dawkins, Sam Harris, and Daniel Dennett filmed a landmark discussion about modern atheism. The video went viral. Now, the transcript of their conversation is illuminated by new essays from three of the original participants and an introduction by Stephen Fry.

"Forty-four percent of the American population is convinced that Jesus will return to judge the living and the dead sometime in the next 50 years," writes Sam Harris. "Imagine the consequences if any significant component of the U.S. government actually believed that the world was about to end and that its ending would be glorious. The fact that nearly half of the American population apparently believes this...should be considered a moral and intellectual emergency."

A belief in free will touches nearly everything that human beings value. It is difficult to think about law, politics, religion, public policy, intimate relationships, morality—as well as feelings of remorse or personal achievement—without first imagining that every person is the true source of his or her thoughts and actions. And yet the facts tell us that free will is an illusion.

As it was in Anna Karenina, Madame Bovary, and Othello, so it is in life. Most forms of private vice and public evil are kindled and sustained by lies. Acts of adultery and other personal betrayals, financial fraud, government corruption - even murder and genocide - generally require an additional moral defect: a willingness to lie. In Lying, bestselling author and neuroscientist Sam Harris argues that we can radically simplify our lives and improve society by merely telling the truth in situations where others often lie.

'Reason and imagination and all mental chatter died down... I forgot my name, my humanness, my thingness, all that could be called me or mine. Past and future dropped away... Lighter than air, clearer than glass, altogether released from myself, I was nowhere around.' Thus Douglas Harding describes his first experience of headlessness, or no self. First published in 1961, this is a classic work which conveys the experience that mystics of all times have tried to put words to.