there is a possibility of dangerous, long-range side effects from the widespread use of ddt and other pesticides. have you considered asking the public health service to take a closer look at this? >> yes, and i know that they already are. i think particularly since this conference broke, but they can examining the matter. >> rachel carson wrote this book about pesticides called "silent spring" in 1962, and it talked about the long-term impacts, the concept of latency and bioaccumulation, which were all new terms. farm animals were dying with regularity because of pesticides. people didn't have any awareness that if the fish ate the bug that was poisoned by pesticides, that that was going to end up in our bodies. >> it touched a raw nerve upon the american public.