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.
It was the first fatal high-school shooting in Canada in more than two decades. A month after Columbine, on May 20, 1999, at Heritage High School in Conyers, Georgia, six students were injured by a 15-year-old shooter, Thomas Solomon, who was reportedly depressed after breaking up with his girlfriend.