Scientist Julian W. Hill, co-inventer of nylon, looks at strands of the product during a celebration in Seaford, Del., for the 50th anniversary of nylon in this file photo of Oct. 20th, 1988. Hill, who was a research chemist for the Dupont Co. when he made a key discovery that led to the development of nylon, died at age 91 Sunday Jan. 28th, 1996, in Hockdssin, Del.(AP Photo/file)