In this book, Sam Harris tears down the wall between scientific facts and human values, arguing that most people are simply mistaken about the relationship between morality and the rest of human knowledge. Harris urges readers to think about morality in terms of human and animal well-being, viewing the experiences of conscious creatures as peaks and valleys on a 'moral landscape'. Because there are definite facts to be known about where we fall on this landscape, Harris foresees a time when science will no longer limit itself to describing what people do in the name of 'morality'; in principle, science should be able to tell what people ought to do to live the best lives possible.