Competitive Service versus Excepted Service Positions. There are two types of non-executive positions in the federal government: 1) those that are in the competitive service, and 2) those that are in the excepted service. Competitive Service â Competitive service positions are subject to the civil service laws passed by Congress.
Post to Facebook. Kevlar inventor Stephanie Kwolek dies at 90 Stephanie Kwolek, the DuPont scientist whose invention, Kevlar, has saved countless lives as the essential ingredient in body armor, has died. Kwolek, of the Sharpley neighborhood in Talleyville, died Wednesday following a brief illness, said her friend, Rita Vasta, who is handling Kwolek's affairs. She was 90.
KS3 science video: Stephanie Kwolek talks about her invention of new polymer material Kevlar. In this short KS3 science video (3.32 mins), Stephanie talks about her life, how she became a chemist and her research at DuPont.roperties of Kevlar. 1  Kevlar is a polymer. 2  This means that it is made up of long chains of individual molecules (monomers) joined together â a bit like a chain of paperclips. 3  The individual chains are held together very strongly by forces of attraction.