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.
The first known mass shooting in the U.S. where students were shot, was on April 9, 1891, when 70 year old, James Foster fired a shotgun at a group of students in the playground of St. Mary's Parochial School, Newburgh, New York, causing minor injuries to several of the students.