general_fact: 51 is the atomic number of antimony.
math_fact: 51 is a pentagonal number as well as a centered pentagonal number (one of the few numbers to be both) and an 18-gonal number and a Perrin number.
trivia: 51 is the atomic number of antimony.
historical_date: February 20th is the day in 1991 that a gigantic statue of Albania's long-time leader, Enver Hoxha, is brought down in the Albanian capital Tirana, by mobs of angry protesters.