math_fact: 568 is the smallest number whose 7^{th} power can be written as the sum of seven 7^{th} powers.
trivia: 568 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: July 21st is the day in 1997 that the fully restored USS Constitution (aka Old Ironsides) celebrates her 200th birthday by setting sail for the first time in 116 years.