general_fact: 89 is the number of units of each colour in the board game Blokus.
math_fact: 89 is also a Markov number, appearing in solutions to the Markov Diophantine equation with other odd-indexed Fibonacci numbers.
trivia: 89 is the atomic number of actinium.
historical_date: March 29th is the day in 1990 that the Czechoslovak parliament is unable to reach an agreement on what to call the country after the fall of Communism, sparking the so-called Hyphen War.