Inventor, futurist and author Ray Kurzweil has long predicted humans will one day be able to transcend the limitations of their biology. In a new book, Kurzweil explains why that day is coming sooner than we might think. He argues that the expansion of the brain's neocortex was the last biological evolution man needed to make. That's because it is inevitably leading to "truly intelligent machines," which Kurzweil calls the last invention that humanity needs to make. Join Diane and Ray Kurzweil for a discussion on prospects for attaining immortality through technology.