general_fact: 128 is the atomic number of unbioctium, an element yet to be discovered.
math_fact: 128 is the largest number which is not the sum of distinct squares.
trivia: 128 is the number of ASCII characters (33 non-printing characters, mostly obsolete control characters that affect how text is processed, and 94 printable).
historical_date: May 7th is the day in 1946 that Tokyo Telecommunications Engineering (later renamed Sony) is founded with around 20 employees.