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.
May 18, 1927 : In the deadliest mass school murder in United States history, former school board member Andrew Kehoe set off three bombs in Bath Township, Michigan killing 45 people and wounding 58. Kehoe killed himself and the superintendent by blowing up his own vehicle.