math_fact: 690 is the smallest number that can not be written as the sum of a triangular number, a cube, and a Fibonacci number.
trivia: 690 is an unremarkable number.
historical_date: November 20th is the day in 1994 that the Angolan government and UNITA rebels sign the Lusaka Protocol in Zambia, ending 19 years of civil war (localized fighting resumes the next year).