dr. bill campbell and talked about the nobel prize honor. reporter: you are looking at the smiling faces of children from a remote west african village, his work helped cure. >> it still is. reporter: dr. bill campbell still feels that raw emotion. >> you don't forget that. reporter: and no one ever will. he is one of three scientists announced this morning to win the nobel prize in medicine. the former pharmaceutical pharmacist for helping to discover the drug 25 years ago which has lowered the incident of river blindness caused by a parasitic worm. >> they are eliminating diseases and there are countries where they have eliminated the disease. >> they were initially used in animals and they found it also worked on people. the pill, taken orally, showed the immediate effects in the earliest test trials. >> it was so moving to be there and to see for example a man totally blind, but to see all of these children who would not be. spread on his quiet street. a neighbor playfully saluting the scientist with a bagpipe. pomp and circumstance aside