general_fact: 84 is the atomic number of polonium.
math_fact: 84 is the sum of the first seven triangular numbers (making it a tetrahedral number), as well as the sum of a twin prime (41 + 43).
trivia: 84 is the atomic number of polonium.
historical_date: March 24th is the day in 1603 that Tokugawa Ieyasu is granted the title of shogun from Emperor Go-Yozei, and establishes the Tokugawa Shogunate in Edo, Japan.