--a fifth student permanently paralyzed
--the girl in the photo, Mary Ann Vecchio was a 14-year-old runaway and didn't meet John Filo who took that Pulitzer Prize-winning photo until the 25th anniversary of the event. He avoided contacting Vecchio because he felt guilty about how much publicity she had to endure because of the photo.
--May 4, 1970 was also a Monday
--"Ohio" by Neil Young was written and recorded within two weeks of the shootings