general_fact: 2 is the number of polynucleotide strands in a DNA double helix.
math_fact: 2 is the number of n-Queens Problem solutions for n = 4.
trivia: 2 is the lowest channel of television in the United States, Canada, Argentina and Mexico on which television signals are broadcast.
historical_date: January 2nd is the day in 1959 that Luna 1, the first spacecraft to reach the vicinity of the Moon and to orbit the Sun, is launched by the Soviet Union.