General fact: 805 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 805 is the number of possible positions in Checkers after 4 moves.
Trivia: 805 is an unremarkable number.
Historical date: March 15th is the day in 1965 that President Lyndon B. Johnson, responding to the Selma crisis, tells U.S. Congress "We shall overcome" while advocating the Voting Rights Act.