Galvanic corrosion is a process that degrades metals electrochemically. This corrosion occurs when two dissimilar metals are located in contact with each other in the presence of an electrolyte, such as salt water, forming a galvanic cell.
But the memories of that tragic day 25 years ago are still vivid to many in Edmond. On Aug. 20, 1986, gunman Patrick Henry Sherrill shot and killed 14 co-workers, wounded six and then took his own life inside the post office where he worked.
At least two women, Susanna A. Brunner in New York and Minnie Westman in Oregon, were known to be mail carriers in the 1880s. Mary Fields, nicknamed Stagecoach Mary, was the first black woman to work for the USPS, driving a stagecoach in Montana from 1895 until the early 1900s. When aviation introduced airmail, the first woman mail pilot was Katherine Stinson who dropped mailbags from her plane at the Montana State Fair in September 1913.