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 April 20, 1999, two senior students named Eric Harris and Dylan Klebold entered Columbine High School in Colorado and attacked the student population with an arsenal of weapons. They killed 13 people and wounded 22 others.The event was one of the longest shooting sprees in history and lasted 49 minutes.he school shooting was the first of its kind in Brazil. Wellington Oliveira came to the school with a suicide note in his pocket, but his quotes during the attack were not published. It was revealed that Oliveira was badly bullied in school and called strange.