context: As for the discovery of nylon, it was in 1938 A.D., and this date marked the starting point for this type of industry (i.e. plastic in general). The inventor of the nylon is Wallace Carothers and his assistants at Du Pont. In 1928 Carothers (1896-1937), born in the state of Iowa, quit his job as a lecturer of organic chemistry at Harvard University to lead the research team at DuPont laboratories in Delaware. There, a research program on reproductive studies began with a study of their formation and factors affecting their properties. Within several years, he and his aides discovered that a proliferating (polymerization) mixture of adipic acid and 6.1-diaminohexane produced an energetic substance that could be drawn into strong silk threads. The polyamide 6,6 was given to this spinoff product before the nylon 6,6 name was found. The first practical application of nylon as a customer product was in 1938 when it was used in the manufacture of toothbrush bristles. However, in October 1939 it was found to be a great application when used in the manufacture of women's socks because of its similarity to the touch of silk and its cheap price.
question: When did nylon discover?
answers.text: 1938 A.D.