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.
After a shooting, f amily members hug outside the Sandy Hook Elementary School in Newtown, Conn. Photo: Reuters The first reported school shooting in what is now the U.S. took place in the 1700s when four Lenape Indians entered a schoolhouse in what is now Greencastle, Pa., and killed the schoolmaster and as many as 10 children, according to K12academics.com.