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.
On January 5, 2011, in Omaha, Nebraska, two people were killed and two more injured in a shooting at Millard South High School. Shortly after being suspended from school, the shooter returned and shot the assistant principal, principal, and the school nurse.