general_fact: 80 is the percentage of American men who say they would marry the same woman if they had it to do all over again.
math_fact: 80 is a ménage number, and is a Harshad number number in base 10.
trivia: 80 is a common limit for the characters per line in computing (derived from the number of columns in IBM cards).
historical_date: March 20th is the day in 1951 that Fujiyoshida, a city located in Yamanashi Prefecture, Japan, in the center of the Japanese main island of Honshū is founded.