some times ago http://www.wired.com published this manifesto by Jaron Lanier, titled "One Half of a Manifesto":http://www.wired.com/wired/archive/8.12/lanier_pr.html and Ray Kurzweil answered like this "One half of an argument":http://www.edge.org/3rd_culture/kurzweil/kurzweil_print.html
