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.
1 The crystallinity of the Kevlar polymer strands contributes significantly to Kevlar's unique strength and rigidity.  CLUE #3: Kevlar is a polyaromatic amide. That is, it contains aromatic and amide groups. Other polymers with a high breaking strength often contain one or both of these molecular groups.