Hecho matemático: 8504 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 8504 is an uninteresting number.
Fecha histórica: April 13th is the day in 1613 that Samuel Argall captures Native American princess Pocahontas in Passapatanzy, Virginia to ransom her for some English prisoners held by her father.