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.
This Day in History: 07/26/1775 - U.S. Postal System Created. In a This Day in History video, learn that on July 26, 1775, the second continental congress established the United States Postal System. Back in the time of the colonies, mail delivery was inconsistent, but during the American Revolution, it became crucial.