Fatto matematico: 18307 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 18307 is an unremarkable number.
Data storica: February 13th is the day in 1935 that a jury in Flemington, New Jersey finds Bruno Hauptmann guilty of the 1932 kidnapping and murder of the Lindbergh baby, the son of Charles Lindbergh.