GUESTS: Gerald Celente Author, Trends: How to Prepare for and Profit from the Changes of the 21st Century (Time Warner Books, 1997) Founder and Director, Trends Research Institute, Rhinebeck, NY David Gelernter Author, Drawing Life: Surviving the Unabomber (The Free Press, 1997) Professor of Computer Science, Yale University, New Haven, CT Longevity centers, vitamin counselors, edible lawns. No, we're not talking about the latest science fiction. This is life on earth in the year 2000 - according to some trend forecasters. We can also look forward to on-line universities, videophones and a new breed of door-to-door salesmen. Ray's guests predict what will be hot in the new millennium and they'll tell us how to prepare and profit from the changes ...on the next Talk of the Nation, from NPR News.